Unconfirmed/Unpublished Planets Catalogue

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Lazarus on 15th December 2011, 3:57 pm

Perhaps in some respects similar to Epsilon Aurigae?

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 16th December 2011, 4:48 am

A curious case, worth to notify:

Zapatero Osorio et al. (2003) - Photometric variability of a young, low-mass brown dwarf

The brown dwarf S Ori 45 could host an undermassive secondary (9-13 Jupiter masses, and losing mass too) in epistellar orbit (0.002-0.003 AUs, Porb=2.5-3.6 hours). Alternate explanations are possible, of course.
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Sirius_Alpha on 5th February 2012, 2:18 pm

Possible hot Jupiter at TWA 13A

Precise Infrared Radial Velocities from Keck/NIRSPEC and the Search for Young Planets
http://arxiv.org/abs/1202.0300

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 9th February 2012, 6:05 am

Some interesting globular cluster neutron stars with undermassive companions (Lynch et al. 2012). Helium dwarfs or "PSR J1719-1438 b-like"?

PSR J1701-3006E (in M62) - m2= 31 Jupiter masses; Porb= 0.1584774951 d = 3.803 hrs
PSR J1701-3006F (in M62) - m2= 21 Jupiter masses; Porb= 0.2054870422 d = 4.932 hrs
PSR J1807−2459A (in NGC 6544) - m2 = 0.0092 Solar = ca. 9.2 Jupiter masses; Porb= 0.071091483516 d = 1.706 hrs

Paper links:

Preprint

Astrophysical Journal issue


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Re: Unconfirmed/Unpublished Planets Catalogue

Post by tommi59 on 9th June 2012, 3:18 am

Exoplanet around strange star appeared on EPE unconfirmed catalog
http://exoplanet.eu/planet.php?p1=PTFO+8-8695&p2=b
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 9th June 2012, 4:14 am

tommi59 wrote:Exoplanet around strange star appeared on EPE unconfirmed catalog
http://exoplanet.eu/planet.php?p1=PTFO+8-8695&p2=b

That is a putative transiting extrasolar planet detected around a young T Tauri star in Orion.
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by tommi59 on 9th June 2012, 5:45 am

Is this large radius for pre main sequence M3 star 1.39 sun??
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Sirius_Alpha on 9th June 2012, 1:27 pm

Yes. Pre-main sequence stars are pretty large, if I recall right, for the same reason young Jovians are.

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Stalker on 9th June 2012, 6:06 pm

Yep it's normal. Even young brown dwarves are as big as the sun today!

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by PlutonianEmpire on 9th June 2012, 7:20 pm

What is the reason/cause for their huge sizes, if I may ask?

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Stalker on 10th June 2012, 2:03 am

Gravitationnal colapsing just after the formation provide more energy than fusion.

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Sirius_Alpha on 21st June 2012, 8:24 pm

Maybe a planet at HD 32297?
Keck/NIRC2 Imaging of the Warped, Asymmetric Debris Disk around HD 32297
http://arxiv.org/abs/1206.4688

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by tommi59 on 28th June 2012, 1:54 pm

Additional-planet systems ?? I found this

Epsilon Eridani c/d? (need to do again) HD 121504 c Tau Boötis c/d? HD 28185 c Iota Horologii c/d (former in 4:1 resonance with b, latter is poorly constrained) 51 Pegasi c/d
Gliese 849 c? (HARPS finds the trend to be continuing downwards, inconsistent with my solution, but the data has not been formally released) Gliese 436 c?/d? (data seems extremely noisy. Many constraints have been placed on additional bodies, which must be accounted for) HD 196050 c (additional periodicities of 1.58 and 3.20 days are minor, but odd) HD 183263 d (needs 2009 data) HD 179949 c (…maybe. Inconclusive solution of 29 days) HD 177830 d (needs 2010 data) HD 168746 c HD 99109 c (definite 2:3 resonance) HD 93083 c (definite 2:3 resonance, but less significant than above) HD 88133 c (possibly. not very obvious on the periodogram) HD 75289 c Pi˛ Ursae Majoris(HD 73108) c? HD 70642 c HD 17092 c HD 4208 c (Neptune)
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Sirius_Alpha on 28th June 2012, 10:11 pm

Source?

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by tommi59 on 29th June 2012, 1:26 am

wikipedia
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by PlutonianEmpire on 29th June 2012, 1:30 am

tommi59 wrote:wikipedia
Isn't it frowned upon to use Wikipedia as a source of information and/or news?

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by jyril on 29th June 2012, 2:33 am

Well, IMO it is okay if the information is properly sourced. At least on Internet forums. Wink

Where you got candidates such as 51 Peg c/d? I don't see any mention of those.

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Sirius_Alpha on 29th June 2012, 5:54 am

Yes, every time Wikipedia is used as a reference, a kitten dies.
I am also having trouble finding references on Wikipedia for some of these claims.

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by jyril on 29th June 2012, 8:01 am

jyril wrote:Well, IMO it is okay if the information is properly sourced.

In which case you don't even need to quote Wikipedia, as you can link directly to the sources. Wink

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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Lazarus on 10th July 2012, 2:14 pm

Casassus et al.: The dynamically disrupted gap in HD 142527

Perhaps there is a ~10 Jupiter mass (proto)planet in a ~90 AU orbit around the star HD 142527, which may help explain the disc structure.

This modelling does not take into account the recently-discovered stellar companion at 12.8 AU (Biller et al. (2012)), though in that paper they note that a binary+planet system could explain the very wide gap.

So perhaps a wide-orbit circumbinary planet in a debris disc system?
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Lazarus on 10th July 2012, 2:42 pm

Lagrange et al.: An insight in the surroundings of HR4796

A possibility that the debris disc around HR 4796A is being shaped by a giant planet (3-8 Jupiter masses) orbiting outside the ring at 92-99 AU. The companion star HR 4796B also likely has an influence on the disc morphology.
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 11th August 2012, 9:23 am

Some interesting abstracts. I'm trusting in upcoming updates...

Polaris: Evolutionary (and Other !) Period Changes and Clues to its Nature

O-C data for the Cepheid Polaris derived from its brightness and radial velocity variations are consistent with a regular period increase of 4.5 seconds per year during the past two centuries, with the exception of a unique hiatus circa 1965 when the pulsation period underwent a brief decrease that is difficult to explain without invoking assimilation of a substellar companion. The 30-year cycle of the Polaris Aa subsystem is evident both in the star’s systemic radial velocity variations and observed times of light maximum, the latter of which display light travel time effects larger than expected. Arguments for overtone versus fundamental mode pulsation in the star appear to favor Polaris as an overtone pulsator, which is supported by its potential cluster membership, yet are currently unable to explain all of its observational characteristics: small amplitude in conjunction with location near the center of the instability strip, rapid period increase, X-ray emission, etc. Perhaps future or ongoing space observations will shed light on the puzzle.

Emphasis mine.

Pre-Cataclysmic System V471 Tau with Confirmed Brown Dwarf and Suspected Extrasolar Planet

We can show that analysis of the (O-C) diagram is a powerful method of detecting new bodies in binary systems. For this purpose we need very symmetric minima with precisely determined shapes. In the case of good covering by observations with high time resolution, it is possible to determine the times of such minima with sufficient accuracy. In the case of V471 Tau, the (O-C) diagram gave us residua which can be explained by the presence of a fourth body with substellar mass in the system.
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Lazarus on 13th August 2012, 1:23 pm

There seem to be several abstracts discussing V471 Tau, e.g. this one which shares one of the authors, maybe a planet, maybe activity.

The brown dwarf is in a mildly elliptical orbit (e = 0.258±0.024) and has at least 46 Jupiter masses, according to this.
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Edasich on 12th September 2012, 10:02 am

Toward accreting exo-moon transit detection?


Monitoring of J1407 for next extrasolar ring system transit

Dr. Eric Mamajek (Cerro Tololo Interamerican Observatory and University of Rochester) has requested AAVSO observers' assistance in monitoring the young star 1SWASP J140747.93-394542.6 (J1407; V=12.3) to help determine the eclipse behavior related to a transiting ringed substellar companion. J1407, he writes, "...underwent a series of symmetric, deep eclipsing events in April/May 2007, consistent with a transiting substellar companion surrounded by a complex ring system moving in front of the star. The series of eclipses were of depth ~0.5-3 magnitudes and occurred over a 52-day period. Unfortunately only a single eclipse sequence was seen, and the period of the ringed companion (likely to be a brown dwarf or giant planet) and the exact scale of the ring system remain unknown. We are gathering observations to test whether this may constitute a moon-forming "protoexosatellite disk". We are asking for nightly photometry in one or more visible photometric bands (preferably V to search for the start of the next eclipse. A brightness dip of more than ~0.15 magnitude in V will indicate the transit of the outermost ring, with additional deeper transits leading up to the central transit approximately 3 weeks later, where an eclipse depth has been measured of at least 3 magnitudes in V band."

Referring to Planetary construction zones in occultation: discovery of an extrasolar ring system transiting a young sun-like star and future prospects for detecting eclipses by circumsecondary and circumplanetary disks.
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Re: Unconfirmed/Unpublished Planets Catalogue

Post by Lazarus on 12th September 2012, 10:32 am

I object to the word "protoexosatellite" - it is a ridiculous construction.

"Protosatellite" would do the job just as well.
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Re: Unconfirmed/Unpublished Planets Catalogue

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