2012ApJ...755...42V


Query : 2012ApJ...755...42V

2012ApJ...755...42V - Astrophys. J., 755, 42 (2012/August-2)

The PTF Orion project: a possible planet transiting a T-Tauri star.

VAN EYKEN J.C., CIARDI D.R., VON BRAUN K., KANE S.R., PLAVCHAN P., BENDER C.F., BROWN T.M., CREPP J.R., FULTON B.J., HOWARD A.W., HOWELL S.B., MAHADEVAN S., MARCY G.W., SHPORER A., SZKODY P., AKESON R.L., BEICHMAN C.A., BODEN A.F., GELINO D.M., HOARD D.W., RAMIREZ S.V., REBULL L.M., STAUFFER J.R., BLOOM J.S., CENKO S.B., KASLIWAL M.M., KULKARNI S.R., LAW N.M., NUGENT P.E., OFEK E.O., POZNANSKI D., QUIMBY R.M., WALTERS R., GRILLMAIR C.J., LAHER R., LEVITAN D.B., SESAR B. and SURACE J.A.

Abstract (from CDS):

We report observations of a possible young transiting planet orbiting a previously known weak-lined T-Tauri star in the 7-10 Myr old Orion-OB1a/25-Ori region. The candidate was found as part of the Palomar Transient Factory (PTF) Orion project. It has a photometric transit period of 0.448413±0.000040 days, and appears in both 2009 and 2010 PTF data. Follow-up low-precision radial velocity (RV) observations and adaptive optics imaging suggest that the star is not an eclipsing binary, and that it is unlikely that a background source is blended with the target and mimicking the observed transit. RV observations with the Hobby-Eberly and Keck telescopes yield an RV that has the same period as the photometric event, but is offset in phase from the transit center by ~ - 0.22 periods. The amplitude (half range) of the RV variations is 2.4 km/s and is comparable with the expected RV amplitude that stellar spots could induce. The RV curve is likely dominated by stellar spot modulation and provides an upper limit to the projected companion mass of Mp sin iorb ≲ 4.8±1.2 MJup; when combined with the orbital inclination, iorb, of the candidate planet from modeling of the transit light curve, we find an upper limit on the mass of the planetary candidate of Mp ≲ 5.5±1.4 MJup. This limit implies that the planet is orbiting close to, if not inside, its Roche limiting orbital radius, so that it may be undergoing active mass loss and evaporation.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: 25 Ori - planets and satellites: detection - stars: individual (2MASS J05250755+0134243, CVSO 30, PTFO 8-8695, PTF1 J052507.55+013424.3) - stars: pre-main sequence

Nomenclature: NAME PTFO 8-8696 N=1.

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 EM* LkCa 15 Or* 04 39 17.7911622816 +22 21 03.390090984   13.01 12.03 11.61   K5:Ve 691 1
2 * psi01 Ori Be* 05 24 44.8273848312 +01 50 47.201915688 3.83 4.76 4.96 5.04 5.26 B1Vn 353 0
3 CVSO 30 TT* 05 25 07.5568292771 +01 34 24.357042405     16.26 15.88 13.70 M3 67 1
4 NAME CVSO 30 b Pl? 05 25 07.5568292771 +01 34 24.357042405           ~ 23 0
5 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 579 0
6 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3636 1
7 Ass Ori OB 1a As* ~ ~           ~ 230 0

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