Unconfirmed/Unpublished Planets Catalogue

Page 7 of 9 Previous  1, 2, 3, 4, 5, 6, 7, 8, 9  Next

View previous topic View next topic Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Sirius_Alpha on 12th September 2012, 12:17 pm

It's definitely a mouthful. And I agree. We don't use the term "protoexoplanetary disk" either.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3402
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 13th September 2012, 12:52 pm

However, if confirmed, it would be the first extrasolar substellar (?) object whose ring (and possibly "proto-satellite") system is detected.

Interesting, ain't it? Smile
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Sirius_Alpha on 13th September 2012, 1:01 pm

Depends on if you count the tentative evidence for a circumplanetary disk at β Pic b.

http://fr.arxiv.org/abs/0903.1101
The observations are more consistent with a circumplanetary (proto-satellite) dust disk or a ring system around the planet, as recently inferred for the planet Fomalhaut b in a similar young debris disk

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3402
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 14th September 2012, 2:47 am

Okay, but here we'd have transit evidence rather imaging hypothesis.
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Sirius_Alpha on 14th September 2012, 8:23 am

The (circumstantial) evidence for a circumplanetary disk at β Pic b comes from transits, too.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3402
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Shellface on 16th February 2013, 12:03 am

tommi59 wrote:Additional-planet systems ?? I found this

oh god

oh god

I was young and naïve! Don't trust people like those!

Also how did you find my sandbox that's kinda strange.

Anyway. I've gotten better at this! Largely due to the HARPS archive. I've been biding my time to actually announce most of the things I've "found", and the one I did was that there's a super-Earth orbiting HD 101930 A (that is a bit dated concerning the analysis, but I can confirm that the variability is not correlated with the bisector span or FWHM). Considering that this is the relevant thread, I guess I can also share something else: HD 219828 c is massive. Like, over the deuterium-burning limit kinda massive.



Assuming the same 1.24 M for the star as Melo et al. (2007), here is a table of orbital parameters:

Epoch (BJD) 2453509.927917
RV HARPS (km/s) -24.09677 ± 0.00215
RV SOPHIE+ (km/s) -24.10319 ± 0.00099
planet b c
period (days) 3.83489 ± 0.00024 4900 ± 120
eccentricity 0.11 ± 0.08 0.814 ± 0.005
argument of periapsis (degrees) 197 ± 26 146.15 ± 0.48
semi-amplitude (m/s) 7.31 ± 0.63 271 ± 6
mass (M) 20.7 ± 1.6 4863 ± 95
mass (MJ) 0.065 ± 0.005 15.3 ± 0.3
Semi-major axis (AU) 0.052 ± <0.001* 6.11 ± 0.10
Number of measurements 63 (51 HARPS, 12 SOPHIE+)
Span (days) 2347.57
Root-mean-square (m/s) 1.46
Excess scatter (m/s) 1.03
Systemic χ² 4.76
*systemic isn't very helpful with semi-major axes, so I only have them to four digits

As you can see, c is very massive. Even at metal-richness of [Fe/H] = ~0.2 dex, such massive companions are rare - of those around solar-type stars, only HD 202206 b and HAT-P-13 c are comparable, and both are considerably more metal rich ([Fe/H] = ~0.3 and ~0.4). HD 219828 c is therefore strongly atypical.

Also atypical is that c is extraordinarily eccentric. An eccentricity that high is extremely rare - only seven planets have higher eccentricities (eight, including HD 28254 b's error). Of these, HD 20782 b, HD 80606 b and HD 28254 b have HD 20781, HD 80607 and HD 28254 B for kozai oscillations, while HD 4113 and HD 22781 show trends implying other companions. HD 7449 has both a stellar companion and a non-linear trend which are likely not intrinsically related. Finally, HD 43197 and HD 98649 show neither of the above. These statistics (4-6 out of 8 ) imply that kozai oscillations are at least one of the main causes of extreme eccentricities. HD 219828 has no known stellar companion - no searches are apparent in literature - but with only approximately half of the orbit observed, it is not yet known whether there is a trend.


Last edited by Shellface on 2nd March 2013, 4:23 pm; edited 2 times in total (Reason for editing : something is seriously wrong with HD 7449)

Shellface
Neptune-Mass
Neptune-Mass

Number of posts : 281
Location : g2 17.∞ 997 t
Registration date : 2013-02-14

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by tommi59 on 16th February 2013, 4:45 am

Well I was most intrigued about potential planet c and d around 51 pegasi not intended to harm anybody ,finding was relatively easy though I sought totally something else
avatar
tommi59
Jovian
Jovian

Number of posts : 536
Age : 39
Location : Baile Atha Cliath
Registration date : 2010-07-31

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Shellface on 16th February 2013, 4:03 pm

Don't sweat it. I didn't expect it, but hey, public internet. As for 51 Peg…

http://oklo.org/2006/07/21/still-feel-gone/

I happened across the same thing, independently. I'm not sure what I found with the 50-something day periodicity, but it too seems to be related to the combination of the Lick and ELODIE sets and is mostly stunted by the ELODIE set's removal.

Still. What remains is the 51 Pegasi hosts a velocity trend of about -1 m/s/y. That's pretty rare of Hot Jupiters - most "clump" (i.e: ~0.05 AU) members are lone. With about ten years passed since the last available Lick data point, maybe there's been some curvature in that trend by now.

Speaking of velocity trends! HD 30177, HD 111232, HD 2638, HD 102117, HD 27894 and HD 28185 all have velocity trends. The first two are linear, the third and fourth are curved, and the last two show changes in acceleration indicating maxima and minima.

(~2800-pixel wide png ahoy!)
http://i72.servimg.com/u/f72/18/12/03/06/trends10.png

Assuming eccentricity = 0, HD 27894 c has a period of 2020 ± 360 days and a mass of 2.51 ± 0.56 MJ, while HD 28185 c has a period of 5100 ± 700 days, and a mass of 3.62 ± 0.68 MJ. HD 27894 c is therefore a typical Jovian planet at a few AU, while HD 28185 c is about twice as isolated and may be a high-mass Jupiter analogue like 55 Cancri d.

(This is the same HD 28185 c I mentioned on that list of "planets", with slight refinement. The neptunian is very tentative, so is not described here)


Last edited by Shellface on 22nd February 2013, 6:57 pm; edited 1 time in total (Reason for editing : whoo links)

Shellface
Neptune-Mass
Neptune-Mass

Number of posts : 281
Location : g2 17.∞ 997 t
Registration date : 2013-02-14

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Stalker on 23rd July 2013, 3:46 am

Towards a theory of extremely intermittent pulsars I: Does something orbits PSR B1931 + 24 ?
We investigate whether one or many companions are orbiting the extremely intermittent pulsar PSR B1931+24. We constrained our analysis on previous observations of eight fundamental properties of PSR B1931+24. The most puzzling properties are the intermittent nature of the pulsar's activity, with active and quiet phases that alternate quasi-periodically; the variation of the slowing-down rate of its period between active and quiet phases; and because there are no timing residuals, it is highly unlikely that the pulsar has a massive companion. Here, we examine the effects that one putative companion immersed in the magnetospheric plasma or the wind of the pulsar might have, as well as the associated electric current distribution. We analysed several possibilities for the distance and orbit of this hypothetical companion and the nature of its interaction with the neutron star. We show that if the quasi-periodic behaviour of PSR B1931+24 was caused by a companion orbiting the star with a period of 35 or 70 days, the radio emissions, usually considered to be those of the pulsar would in that specific case be emitted in the companion's environment. We analysed four possible configurations and conclude that none of them would explain the whole set of peculiar properties of PSR 1931+24. We furthermore considered a period 70 days for the precession of the periastron associated to an orbit very close to the neutron star. This hypothesis is analysed in a companion paper.

_________________
avatar
Stalker
Jovian
Jovian

Number of posts : 521
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Lazarus on 23rd July 2013, 12:21 pm

Towards a theory of extremely intermittent pulsars II: Asteroids at a close distance
http://arxiv.org/abs/1305.6726

The sequel.

One of these properties, at least for PSR B1931+24, is a quasi-periodic behaviour of about 35 days. In paper I, it has been found that this cannot be a consequence of a planet orbiting the neutron star with that period, but 70 =35 × 2 days could be the period of the precession of the periastron of something orbiting at a close distance of the neutron star.

Apparently there is a paper III in the works...
avatar
Lazarus
dG star
dG star

Number of posts : 2771
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Stalker on 15th August 2013, 6:17 am

I have this link from 2010, still nothing in the litterature...


Confirmation of binary planetary mass companions to a binary A-star
Jenny Patience wrote:With near-infrared photometry and spectra, we propose to observe a close pair of candidate planetary mass companions orbiting a binary A-star. If spectroscopically confirmed as L-type objects, these companions would be the first circumbinary planets orbiting Main Sequence stars. Comparison of the absolute K-band magnitudes with evolutionary models suggests masses of ~5Mjup and ~6Mjup, among the lowest mass planets imaged to date. The companions were detected as part of our volume-limited survey of A-stars within 75pc (GN-2008B-Q-119, PI: Patience) and second epoch observations were recently obtained (GN-2010A-Q-99, PI: De Rosa), indicating that the companions have a proper motion more consistent with the primary than a background object. The youth of the system, 30Myr, combined with the ~4?.5 separation of the companions enabled the detection of these intriguing objects in our snaphot survey. If confirmed, the entire system presents a very interesting case study in the diversity of planetary architectures: the host star is in an eccentric 11-day orbit and is surrounded by a debris disk estimated to be ~30AU in radius, and, at a projected separation of ~250AU, are a pair of planetary mass companions separated from each other by ~10AU.
http://www4.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/cadcbin/gsa/wdbi.cgi/gsa/gsa_science_program/more/GN-2010A-DD-6

_________________
avatar
Stalker
Jovian
Jovian

Number of posts : 521
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 15th August 2013, 12:23 pm

And I don't know the reason (neither I remember the source, sadly) but it was supposed to match with Iota Delphini, which has those binary parameters.
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Lazarus on 15th August 2013, 2:50 pm

There's no guarantee that these objects are actually planets in the Iota Delphini system. For example, they could be unrelated background objects, or some other kind of false positive.
avatar
Lazarus
dG star
dG star

Number of posts : 2771
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Shellface on 15th August 2013, 10:25 pm

Eh. The SB9 does indeed list an 11-day single-lined orbit for Iota Delphini, which is (rather expectably) an Am star. The system has modestly large proper motion (39, -8 mas/yr), enough so that a two-year separation in observations could detect common proper motion to high confidence, so I guess either it's a more elaborate false positive (such as a similar-PM foreground/background late-type binary), or more data has been/is being collected. On that vein, there are a many observations in the Keck archive from NIRC-2 spanning 2010-11, with the 2011 observations indicating "follow-up of candidates". So, maybe announcement has been/is being postponed for follow-up?

Shellface
Neptune-Mass
Neptune-Mass

Number of posts : 281
Location : g2 17.∞ 997 t
Registration date : 2013-02-14

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Stalker on 21st August 2013, 2:02 pm

Some unconfirmed or unpublished (or not available papers) brown dwarfs and exoplanets:
http://adsabs.harvard.edu/abs/2011AAS...21720102M
http://arxiv.org/abs/1303.0999
http://arxiv.org/abs/1208.3591

_________________
avatar
Stalker
Jovian
Jovian

Number of posts : 521
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 27th November 2013, 8:49 am

One planet has vanished, but I don't find out which:
 
http://exoplanet.eu/catalog/
 
Established in February 1995
Developped and maintained by the exoplanet TEAM
update : Nov. 26, 2013 (1047 planets)
Please report any problems to vo.exoplanet@obspm.fr
 
 
Yesterday the count was 1,048.
 
However I notice a new entry between the unconfirmed planet
 
http://exoplanet.eu/catalog/kh_15d_b/
 
But I would label it KH 15D (AB)b, right?
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Baltazar on 29th November 2013, 7:41 am

Hi everyone

Has the suspected companion of Epsilon Ophiuchi been confirmed? Not sure if it was substellar or brown dwarf though.
avatar
Baltazar
Meteor
Meteor

Number of posts : 29
Registration date : 2011-01-08

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 29th November 2013, 10:57 am

Baltazar wrote:Hi everyone

Has the suspected companion of Epsilon Ophiuchi been confirmed? Not sure if it was substellar or brown dwarf though.
Epsilon Ophiuchi?? Suspect 
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Baltazar on 30th November 2013, 10:24 am

Edasich wrote:
Epsilon Ophiuchi?? Suspect 
Yes, Yed Posterior, one (not very impressive) yellow-ish giant star.

There have been claims that it has a low-mass companion.
avatar
Baltazar
Meteor
Meteor

Number of posts : 29
Registration date : 2011-01-08

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 30th November 2013, 2:19 pm

Got any reference about these claims?
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Lazarus on 26th December 2013, 3:34 pm

Regarding the Iota Delphini system mentioned upthread, see Wahhaj et al. (2013) "The Gemini Planet-finding Campaign: The Frequency Of Giant Planets around Debris Disk Stars"

Table 6 lists both of the candidate companions of Iota Delphini (HD 196544) as background objects.
avatar
Lazarus
dG star
dG star

Number of posts : 2771
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 27th December 2013, 5:25 am

Table 6 lists both of the candidate companions of Iota Delphini (HD 196544) as background objects.

Good find, Lazarus!

I have something too. Remember the imaged substellar companion of GSC 08047-00232 EPE doesn't list in the Catalog along with HD 203030 b?

An image to refresh your memory...



In the PhD thesis of Christian Ginski (availabe at University of Jena website, at following URL) there is claim of astrometric detection of GSC 08047-00232 b's motion, as well as better astrometric characterization of the binary brown dwarf orbiting HD 130948.

I guess these reports have been officially published in this paper:

Astrometric monitoring and orbit constraint of the GSC 08047−00232 system with VLT/NaCo

Sadly there is no arXiv preprint of the latter publication (yet). Anyway the orbit of GSC 08047-00232 b is detected, located nearly 840 AUs away from primary star and appears face-on (i~180°) and highly eccentric (0.26 < e < 0.96, with best fit at 0.95 I guess).

Since the thesis is publicly available I don't think it's an embargo breach. Or is it?
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Lazarus on 27th December 2013, 6:10 am

If it's published then I'd say it's fair game.

Seem to be two families of solutions for GSC 08047-00232, one with high eccentricity e~0.95 and nearly face-on orientation i~180°, and one with low eccentricity e~0.28 and a more edge-on inclination i~110°.
avatar
Lazarus
dG star
dG star

Number of posts : 2771
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 1st January 2014, 11:47 am

More about putative substellar companions to B subdwarf stars in these 2014 presentations:

http://www.na.astro.it/~silvotti/exotime/schuh_tucson.pdf
http://www.na.astro.it/~silvotti/exotime/silvotti_tucson.pdf

A possible substellar companion around PG 0044+097 (HD 4539), B subdwarf in Pisces.
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 11th January 2014, 5:30 am

HIP 78530 b disproven?

A Thermal Infrared Imaging Study of Very Low-Mass, Wide Separation Brown Dwarf Companions to Upper Scorpius Stars: Constraining Circumstellar Environments

We additionally find that the 1-4um colors of HIP 78530B match a spectral type of M3+-2, inconsistent with the M8 spectral type assigned based on its near-IR spectrum, indicating it may be a low-mass star rather than a BD.

Sad
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Unconfirmed/Unpublished Planets Catalogue

Post by Sponsored content


Sponsored content


Back to top Go down

Page 7 of 9 Previous  1, 2, 3, 4, 5, 6, 7, 8, 9  Next

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum