Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: HD 114762 - The first planet candidate, revealed to be M dwarf 17th October 2019, 9:28 pm | |
| Determining the mass of the planetary candidate HD 114762 b using Gaia https://arxiv.org/abs/1910.07835 - Quote :
- The first planetary candidate discovered with radial velocities around a solar-like star other than the Sun, HD 114762 b, by Latham et al. (1989) was detected with a minimum mass of 11 Mjup. The small v sin(i)~0 km/s otherwise measured by spectral analysis led to suspect that this companion of a late-F sub-giant star better correspond to a massive brown dwarf (BD), or even a low-mass M-dwarf nearly face-on. To our knowledge, the nature of HD 114762 b is still undetermined. Thanks to the first data release DR1 of the Gaia mission, the astrometric noise measured for this system allows us to derive new constraints on the astrometric motion of HD 114762 and on the mass of its companion. We use a method, GASTON, introduced in a preceding paper, able to simulate Gaia data and finding the distribution of inclinations compatible with the astrometric excess noise. With an inclination of 6.23(+1.93)(-1.25) degrees, the mass of the companion is constrained to M_b=107(+31)(-27) Mjup. HD 114762 b thus belong indeed to the M dwarf domain, down to brown dwarfs, with M_b>13.5 Mjup at the 3-sigma level, and is actually not a planet.
_________________ Caps Lock: Cruise control for 'Cool'!
| |
|
Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: HD 114762 - The first planet candidate, revealed to be M dwarf 18th October 2019, 6:26 pm | |
| So long to this classic exoplanet candidate Though with a minimum mass of 11 Jupiters, this kind of thing was always on the cards. | |
|
Edasich dK star
Number of posts : 2297 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: HD 114762 - The first planet candidate, revealed to be M dwarf 20th October 2019, 5:03 am | |
| There might be the possibility of circum-binary substellar companions, as for HD 202206. | |
|
Sponsored content
| Subject: Re: HD 114762 - The first planet candidate, revealed to be M dwarf | |
| |
|