Extrasolar Visions II
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Extrasolar Visions II

Extrasolar Planets.
 
HomeHome  SearchSearch  Latest imagesLatest images  RegisterRegister  Planet TablePlanet Table  Log in  

 

 Teegarden's Star

Go down 
4 posters
AuthorMessage
Lazarus
dF star
dF star



Number of posts : 3337
Registration date : 2008-06-12

Teegarden's Star Empty
PostSubject: Teegarden's Star   Teegarden's Star Empty30th March 2014, 8:12 am

Was wondering where SIMBAD was getting its reference to Teegarden's Star being a brown dwarf.
Appears to be the following:

Gagné et al. (2014) "BANYAN. II. Very Low Mass and Substellar Candidate Members to Nearby, Young Kinematic Groups with Previously Known Signs of Youth"
http://adsabs.harvard.edu/abs/2014ApJ...783..121G

Uses the 2MASS identification of this object 2MASS J02530084+1652532:
Quote :
2MASS J02530084+1652532 is an M7 dwarf for which models fitting suggest a marginally low log g ~ 4.5 (Witte et al. 2011). Without making any assumption on its age, we find that this object is a 13 – 15 MJup BD candidate member to ARG with PHk = 25.5% and CHk = 29.7%. A measurement of its radial velocity and distance, as well as a thorough analysis of its spectral properties would be needed to confirm this.


Last edited by Lazarus on 18th June 2019, 12:19 pm; edited 1 time in total
Back to top Go down
Edasich
dK star
dK star
Edasich


Number of posts : 2267
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

Teegarden's Star Empty
PostSubject: Re: Teegarden's Star   Teegarden's Star Empty31st March 2014, 12:35 pm

According to Barnes et al. (2012) that nearby star could host a close-in Neptune-mass planet within the Habitable Zone too.
Back to top Go down
Lazarus
dF star
dF star



Number of posts : 3337
Registration date : 2008-06-12

Teegarden's Star Empty
PostSubject: Re: Teegarden's Star   Teegarden's Star Empty18th June 2019, 12:13 pm

A&A Forthcoming: Zechmeister et al. (2019) "The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star"

https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/201935460

As per the majority of studies bar the one in the first post of this thread, Teegarden's Star comes out as a very-low-mass star rather than a brown dwarf: estimated mass 0.089 solar masses. It is relatively quiet for its spectral type (M7V), likely age 8–10 Gyr.

Teegarden b has minimum mass ~1.25 Earths, 4.9-day orbit (0.0252 AU).
Teegarden c has minimum mass ~1.11 Earths, 11.409-day orbit (0.0443 AU).

According to figure 13, Teegarden c is in the conservative HZ (using Kopparapu et al., 2014), Teegarden b is in the optimistic inward extension.

Planet b does not appear to be transiting, they did not search for transits of planet c.
Back to top Go down
Led_Zep
SuperJovian
SuperJovian
Led_Zep


Number of posts : 721
Location : France
Registration date : 2011-09-09

Teegarden's Star Empty
PostSubject: Re: Teegarden's Star   Teegarden's Star Empty18th June 2019, 6:18 pm

Back to top Go down
Sirius_Alpha
Admin
Admin
Sirius_Alpha


Number of posts : 4319
Location : Earth
Registration date : 2008-04-06

Teegarden's Star Empty
PostSubject: Re: Teegarden's Star   Teegarden's Star Empty18th June 2019, 8:35 pm

On arXiv:

The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star
https://arxiv.org/abs/1906.07196

On the Habitability of Teegarden's Star planets
https://arxiv.org/abs/1906.07704

Quote :
We study the habitability of the two 1-2 Earth-mass planets, recently detected by the CARMENES collaboration, around the ultra-cool nearby M dwarf Teegarden's Star. With orbital periods of 4.9 and 11.4 days, both planets are likely to be within the Habitable Zone and tidally locked. They are among the most Earth-like exoplanets yet discovered. Applying an analytical habitability model we find that surface liquid water could be present on both planets for a wide range of atmospheric properties, which makes them attractive targets for bio-signature searches. The prospects of the planets retaining such an atmosphere over their history are discussed.

_________________
Caps Lock: Cruise control for 'Cool'!
Back to top Go down
https://solar-flux.forumotion.com/
Sponsored content





Teegarden's Star Empty
PostSubject: Re: Teegarden's Star   Teegarden's Star Empty

Back to top Go down
 
Teegarden's Star
Back to top 
Page 1 of 1
 Similar topics
-
» Scholz's Star B or b?
» Planet at 30 Arietis B?
» Another star in the HR 4796 system
» 1.7 M_J planet around "The giant star"
» Barnard's Star : RV monitoring

Permissions in this forum:You cannot reply to topics in this forum
Extrasolar Visions II :: Extrasolar Visions :: Extrasolar News and Discoveries-
Jump to: