TY - JOUR
T1 - LUpus-TR-3B
T2 - A low-mass transiting hot jupiter in the galactic plane?
AU - Weldrake, David T.F.
AU - Bayliss, Daniel D.R.
AU - Sackett, Penny D.
AU - Tingley, Brandon W.
AU - Gillon, Michael
AU - Setiawan, Johny
PY - 2008
Y1 - 2008
N2 - 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., and 0.82 ± 0.05 R, respectively. Limb-darkened transit fitting yields a companion radius of 0.89 ± 0.07 R, and an orbital inclination of 88.3±1.3-0.8 deg. Magellan 6.5 m MIKE radial velocity measurements reveal a 2.4 σ K = 114 ± 25 m s-1 sinusoidal variation in phase with the transit ephemeris. The resulting mass is 0.81 ± 0.18 MJ and density 1.4 ± 0.4 g cm-3. Y-band PANIC image deconvolution reveals a V ≥ 21 red neighbor 0.4 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.
AB - 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., and 0.82 ± 0.05 R, respectively. Limb-darkened transit fitting yields a companion radius of 0.89 ± 0.07 R, and an orbital inclination of 88.3±1.3-0.8 deg. Magellan 6.5 m MIKE radial velocity measurements reveal a 2.4 σ K = 114 ± 25 m s-1 sinusoidal variation in phase with the transit ephemeris. The resulting mass is 0.81 ± 0.18 MJ and density 1.4 ± 0.4 g cm-3. Y-band PANIC image deconvolution reveals a V ≥ 21 red neighbor 0.4 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.
KW - Planetary systems
KW - Stars: individual (Lupus-TR-3)
KW - Techniques: photometric
KW - Techniques: radial velocities
UR - http://www.scopus.com/inward/record.url?scp=43149101068&partnerID=8YFLogxK
U2 - 10.1086/529519
DO - 10.1086/529519
M3 - Article
SN - 0004-637X
VL - 675
SP - L37-L40
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1 PART 2
ER -