Article (Scientific journals)
Lupus-TR-3b: A Low-Mass Transiting Hot Jupiter in the Galactic Plane?
Weldrake, David T F; Bayliss, Daniel D R; Sackett, Penny D et al.
2008In Astrophysical Journal, 675, p. 37-L40
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Keywords :
Stars: Planetary Systems; stars: individual (Lupus-TR-3); Techniques: Photometric; Techniques: Radial Velocities
Abstract :
[en] We present a strong case for a transiting hot Jupiter planet identified during a single-field transit survey toward the Lupus Galactic plane. The object, Lupus-TR-3b, transits a V=17.4 K1 V host star every 3.91405 days. Spectroscopy and stellar colors indicate a host star with effective temperature 5000 +/- 150 K, with a stellar mass and radius of 0.87 +/- 0.04 M[SUB]solar[/SUB] and 0.82 +/- 0.05 R[SUB]solar[/SUB], respectively. Limb-darkened transit fitting yields a companion radius of 0.89+/-0.07 R[SUB]J[/SUB] and an orbital inclination of 88.3[SUP]+1.3[/SUP][SUB]-0.8[/SUB] deg. Magellan 6.5 m MIKE radial velocity measurements reveal a 2.4 sigma K = 114 +/- 25 m s[SUP]-1[/SUP] sinusoidal variation in phase with the transit ephemeris. The resulting mass is 0.81 +/- 0.18 M[SUB]J[/SUB] and density 1.4 +/- 0.4 g cm[SUP]-3[/SUP]. Y-band PANIC image deconvolution reveals a V>=21 red neighbor 0.4[SUP]''[/SUP] away which, although highly unlikely, we cannot conclusively rule out as a blended binary with current data. However, blend simulations show that only the most unusual binary system can reproduce our observations. This object is very likely a planet, detected from a highly efficient observational strategy. Lupus-TR-3b constitutes the faintest ground-based detection to date, and one of the lowest mass hot Jupiters known.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Weldrake, David T F;  Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany ; .
Bayliss, Daniel D R;  Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, Cotter Road, Weston Creek, ACT 2611, Australia.
Sackett, Penny D;  Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, Cotter Road, Weston Creek, ACT 2611, Australia.
Tingley, Brandon W;  Institute d'Astronomy et Astrophysique, Université Libré de Bruxelles, Belgium.
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Setiawan, Johny;  Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany ; .
Language :
English
Title :
Lupus-TR-3b: A Low-Mass Transiting Hot Jupiter in the Galactic Plane?
Publication date :
01 March 2008
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, Chicago, United States - Illinois
Volume :
675
Pages :
L37-L40
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/0711.1746
Available on ORBi :
since 30 October 2009

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