Re: Unconfirmed/Unpublished Planets Catalogue

Lazarus · by Lazarus on Thu Aug 28, 2008 11:10 am

CARMA Millimeter-Wave Aperture Synthesis Imaging of the HD 32297 Debris Disk
There is a possibility that asymmetries seen in the debris disc of the A-type star HD 32297 are caused by resonances with an orbiting planet.

...and since I mentioned it elsewhere...

How Observations of Circumstellar Disk Asymmetries Can Reveal Hidden Planets: Pericenter Glow and its Application to the HR 4796 Disk
Structures in the circumstellar disc around HR 4796A might be caused by an unseen planet, but the companion star HR 4796B might be responsible instead.

Sirius_Alpha · by Sirius_Alpha on Wed Sep 03, 2008 6:46 pm

First Results From The SDSS-III Multi-object APO Radial-velocity Exoplanet Large-area Survey (MARVELS)
Link

Abstract wrote:We present the first light results from the Multi-object APO Radial-Velocity Exoplanet Large-area Survey (MARVELS). MARVELS is part of the on-going Sloan Digital Sky Survey (SDSS) III survey which started in July 2008 and will end in July 2014. The data are taken with a multi-object fixed delay interferometer coupled to a R=11,000 spectrograph capable of acquiring precision radial velocities (3-20 m/s depending on V magnitudes) for ~60 objects simultaneously in the 3 degree field of view of the SDSS telescope. MARVELS is to monitor a total of 11,000 V=8-12 relatively bright survey stars over ~800 square degrees over the 6 years. The survey stars include about 90% F8 and later type main sequence stars and subgiants, and 10% G and K giants with V=7.6-12. MARVELS will produce the largest statistically well defined sample of giant planets drawn from a large of host stars with a diverse set of masses, compositions, and ages which will be used to study exoplanet diversity and planet formation, migration & dynamical evolution. It will also possibly discover rare planet systems and identify signposts for lower-mass or more distant planets. The first two year survey data will be released to the public in 2011. A new planet in a spectroscopic binary system discovered in the MARVELS pilot program will also be reported..

Lazarus · by Lazarus on Thu Sep 04, 2008 7:33 am

Photometric Follow-up of 6 OGLE Transiting Planets Candidates
Period variations in OGLE-TR-111 may indicate a second planet in the system. Plus another unconfirmed planet-host, OGLE-TR-142.

Edasich · by Edasich on Thu Sep 04, 2008 7:47 am

Abstractsonline uses to give only vague references.
Never a solid full text article
Often such news are quickly forgotten

Lazarus · by Lazarus on Fri Sep 05, 2008 10:12 am

Judging by a few papers that appeared on the arXiv in the last couple of weeks, there's an upcoming microlensing planet detection, see e.g. Microlensing Zone of Planets Detectable through the Channel of High-Magnification Events

MOA-2007-BLG-400Lb. See this thread.

Sirius_Alpha · by Sirius_Alpha on Tue Sep 09, 2008 7:31 pm

Three possible new planets from dust disk morphology.

http://www.space.com/scienceastronomy/080909-st-planet-gaps.html

Perhaps a jovian planet at 3.5 AU around SR 21,
Perhaps a jovian planet 10-20 AU around HD 135344 B.
Perhaps one or two jovian planets around TW Hydrae.

Lazarus · by Lazarus on Wed Sep 10, 2008 5:43 am

Sirius_Alpha wrote:Three possible new planets from dust disk morphology.

http://www.space.com/scienceastronomy/080909-st-planet-gaps.html

Perhaps a jovian planet at 3.5 AU around SR 21,
Perhaps a jovian planet 10-20 AU around HD 135344 B.
Perhaps one or two jovian planets around TW Hydrae.

The paper is available on arXiv here (it dates back to May). Interestingly they found that the inner disc of TW Hya is orientated at roughly 4 degrees to the line of sight. If the inner disc represents the inclination of the planets, it would make the RV companion (if it exists) about 16 Jupiter masses (brown dwarf range).

Edasich · by Edasich on Wed Sep 10, 2008 7:38 am

Three possible new planets from dust disk morphology.

If really existing, they could make my day cheers

Sirius_Alpha · by Sirius_Alpha on Fri Sep 12, 2008 11:25 pm

According to SIMBAD, TYC 7190-2111-1 (TWA 7) may have a planet.

marasama · by marasama on Thu Sep 18, 2008 11:01 am

WD 1847-223J (white dwarf)
Man, I cannot find this puppy in SIMBAD.
Detected faint objects around it in 2004.
Objects are still present in 2006, but the positions did not move.
Then the objects are background stars/objects.

Search for Giant Planets around White Dwarfs with HST, Spitzer, and VLT
Same paper, different links.
Abstract
Harvard paper

Lazarus · by Lazarus on Sat Sep 20, 2008 1:10 pm

marasama wrote:Man, I cannot find this puppy in SIMBAD.

While WD 1847-223J is unrecognised, there is an object WD J1847-223... might be that one.

Lazarus · by Lazarus on Wed Sep 24, 2008 1:55 pm

Deep MMT Transit Survey of the Open Cluster M37 IV: Limit on the Fraction of Stars With Planets as Small as 0.3 R_J

Unfortunately, no planet transits were detected around stars in the M37 cluster, but an unrelated field star shows signs that it may have a Jupiter-radius planet in a 0.77 day orbit (an "extremely hot Jupiter" or to use the term that the SWEEPS survey used for planets in this period range, an ultra-short-period-planet). Because the star is faint, getting an RV confirmation will be tricky.

Sirius_Alpha · by Sirius_Alpha on Wed Oct 01, 2008 8:42 pm

m sini i < 0.5 M_jup planet with P ~ 5 days from HARPS.
http://arxiv.org/abs/0810.0201

Edasich · by Edasich on Wed Nov 19, 2008 8:55 am

An unconfirmed recent microlensing event:

OGLE-2002-BLG-045

Assuming host star's mass around 0.3 M_Sun a planet of a few Jupiter masses is likely to orbit this faraway star.
No orbital parameters available though pale

.
The case is still under study.

Source paper:

Repeating microlensing events in the OGLE data

Edasich · by Edasich on Wed Nov 19, 2008 10:52 am

Vega was supposed to host a <30 Mj within 30 AUs or so. Solstation talks about http://www.solstation.com/stars/vega.htm

Modelling simulations by Wilner's team (including Matt Holman, Paul Ho, and Marc Kuchner) suggested that the semimajor axis of the planet's orbit may center around 30 AUs -- at Neptune's orbital distance in the Solar System. The simulations also indicated that the planet must be smaller than 30 times Jupiter's mass. A larger planetary mass would cause the observed dust clumps to overlap by destroying and the hypothesized orbital resonances

Then the Neptune-like planet model upcame and the "Vegan dwarf" were not discussed anymore.

Other simulations by Nick N. Gorkavyi and Tanya A. Taidakova (Schafer Corporation) of an observed dust disk ring arc at 95 AUs also suggested that there may be a sub-Jovian planet between 90 to 100 AUs out from Vega. The simulations indicated that one (or more) very massive planet within 50 to 60 AUs may have destroyed the inner circumstellar dust disk by gravitational scattering (Abstract for 2002 AAS session 86.07).

There is also an animation (Vega b looks quite eccentric too; e=0.6):

Assuming the planet laying at 30 AUs and e=0.6, we should have an object swinging between 12 AUs and 48 AUs (apastron). Moreover if the habitable zone lies at 7 AUs, such object would lay in system's water zone at periastron and beyond the snowline at apastron.

More informations about simulations here: The Geometry of Resonant Signatures in Debris Disks with Planets

Maybe the methods and instruments which have allowed the detection of Fomalhaut b and HR 8799's trio could unveil exoplanets also around this bright star. cyclops