Reflected Light in HD 20782 b

View previous topic View next topic Go down

Reflected Light in HD 20782 b

Post by Edasich on 30th November 2015, 10:12 am

No transit but substellar/planetary nature for HD 20782 b seems confirmed

Evidence for Reflected Light from the Most Eccentric Exoplanet Known

Planets in highly eccentric orbits form a class of objects not seen within our Solar System. The most extreme case known amongst these objects is the planet orbiting HD 20782, with an orbital period of 597 days and an eccentricity of 0.96. Here we present new data and analysis for this system as part of the Transit Ephemeris Refinement and Monitoring Survey (TERMS). We obtained CHIRON spectra to perform an independent estimation of the fundamental stellar parameters. New radial velocities from AAT and PARAS observations during periastron passage greatly improve the our knowledge of the eccentric nature of the orbit. The combined analysis of our Keplerian orbital and Hipparcos astrometry show that the inclination of the planetary orbit is > 1.25 degrees, ruling out stellar masses for the companion. Our long-term robotic photometry show that the star is extremely stable over long timescales. Photometric monitoring of the star during predicted transit and periastron times using MOST rule out a transit of the planet and reveal evidence of phase variations during periastron. These possible photometric phase variations are likely caused by reflected light from the planet's atmosphere and the dramatic change in star--planet separation surrounding the periastron passage.
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: Reflected Light in HD 20782 b

Post by Led_Zep on 21st March 2016, 12:38 pm

http://www.spacedaily.com/reports/Most_eccentric_planet_ever_known_flashes_astronomers_with_reflected_light_999.html

Most eccentric planet ever known flashes astronomers with reflected light
avatar
Led_Zep
Saturn-Mass
Saturn-Mass

Number of posts : 498
Location : France
Registration date : 2011-09-09

View user profile

Back to top Go down

View previous topic View next topic Back to top


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