Article (Scientific journals)
Warm Spitzer Occultation Photometry of WASP-26b at 3.6µm and 4.5µm
Mahtani, D. P.; Maxted, P. F. L.; Anderson, D. R. et al.
2013In Monthly Notices of the Royal Astronomical Society, 432 (1), p. 693-701
Peer Reviewed verified by ORBi
 

Files


Full Text
1303.4596v2.pdf
Author preprint (2.36 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] We present new warm Spitzer occultation photometry of WASP-26 at 3.6µm and 4.5µm along with new transit photometry taken in the g,r and i bands. We report the first detection of the occultation of WASP-26b, with occultation depths at 3.6µm and 4.5µm of 0.00126 +/- 0.00013 and 0.00149 +/- 0.00016 corresponding to brightness temperatures of 1825+/-80K and 1725+/-89K, respectively. We find that the eccentricity of the orbit is consistent with a circular orbit at the 1{\sigma} level with a 3{\sigma} upper limit of e < 0.04. According to the activity-inversion relation of Knutson et al. (2010), WASP-26b is predicted to host a thermal inversion. The brightness temperatures deduced from the eclipse depths are consistent with an isothermal atmosphere, although it is within the uncertainties that the planet may host a weak thermal inversion. The data are equally well fit by atmospheric models with or without a thermal inversion. We find that variation in activity of solar-like stars does not change enough over the time-scales of months or years to change the interpretation of the Knutson et al. (2010) activity-inversion relation, provided that the measured activity level is averaged over several nights. Further data are required to fully constrain the thermal structure of the atmosphere because the planet lies very close to the boundary between atmospheres with and without a thermal inversion.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Mahtani, D. P.
Maxted, P. F. L.
Anderson, D. R.
Smith, A. M. S.
Smalley, B.
Tregloan-Reed, J.
Southworth, J.
Madhusudhan, N.
Collier Cameron, A.
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Harrington, J.
Hellier, C.
Pollacco, D.
Queloz, D.
Triaud, A. H. M. J.
West, R. G.
More authors (6 more) Less
Language :
English
Title :
Warm Spitzer Occultation Photometry of WASP-26b at 3.6µm and 4.5µm
Publication date :
01 June 2013
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
432
Issue :
1
Pages :
693-701
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
11 Pages,8 Figures,5 Tables, in MNRAS
Available on ORBi :
since 22 April 2013

Statistics


Number of views
36 (1 by ULiège)
Number of downloads
75 (1 by ULiège)

Scopus citations®
 
10
Scopus citations®
without self-citations
8
OpenCitations
 
30

Bibliography


Similar publications



Contact ORBi