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  

 

 ROXs 42B - Young binary M dwarf with substellar companion(s?)

Go down 
+2
Edasich
Sirius_Alpha
6 posters
Go to page : Previous  1, 2
AuthorMessage
Sirius_Alpha
Admin
Admin
Sirius_Alpha


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

ROXs 42B - Young binary M dwarf with substellar companion(s?) - Page 2 Empty
PostSubject: Re: ROXs 42B - Young binary M dwarf with substellar companion(s?)   ROXs 42B - Young binary M dwarf with substellar companion(s?) - Page 2 Empty2nd April 2014, 10:49 am

A First-Look Atmospheric Modeling Study of the Young Directly-Imaged Planet-Mass Companion, ROXs 42Bb
http://arxiv.org/abs/1404.0131

Quote :
We present and analyze JKsL′ photometry and our previously published H-band photometry and K-band spectroscopy for ROXs 42Bb, an object Currie et al. (2014) first reported as a young directly imaged planet-mass companion. ROXs 42Bb exhibits IR colors redder than field L dwarfs but consistent with other planet-mass companions. From the H2O-2 spectral index, we estimate a spectral type of L0 ± 1; weak detections/non-detections of the CO bandheads, NaI, and CaI support evidence for a young, low surface gravity object primarily derived from the H2(K) index. ROXs 42Bb's photometry/K-band spectrum are inconsistent with limiting cases of dust-free atmospheres (COND) and marginally inconsistent with the AMES/DUSTY models and the BT-SETTL models. However, ROXS 42Bb data are simultaneously fit by atmosphere models incorporating several micron-sized dust grains entrained in thick clouds, although further modifications are needed to better reproduce the K-band spectral shape. ROXs 42Bb's best-estimated temperature is Teff ∼ 1950--2000 K, near the low end of the empirically-derived range in Currie et al. (2014). For an age of ∼ 1--3 Myr and considering the lifetime of the protostar phase, ROXs 42Bb's luminosity of log(L/L⊙) ∼ -3.07 ± 0.07 implies a mass of 9+3−3 MJ, making it one of the lightest planetary mass objects yet imaged.

As for the nature of the second planet candidate, they find that the colours of the object are consistent with it being an early-type (A- or F-type) star redenned by interstellar dust. They conclude the object is not a second planetary mass companion.

_________________
Caps Lock: Cruise control for 'Cool'!
Back to top Go down
https://solar-flux.forumotion.com/
 
ROXs 42B - Young binary M dwarf with substellar companion(s?)
Back to top 
Page 2 of 2Go to page : Previous  1, 2
 Similar topics
-
» Planet PZ Tel b?
» SR 12 ABb - Substellar (planetary?) companion to binary T Tauri star
» MARVELS-1b
» A proto-helium white dwarf stripped by a substellar companion
» Substellar companion to CT Cha

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