RE-EVALUATING WASP-12b: STRONG EMISSION AT 2.315 μm, DEEPER OCCULTATIONS, AND AN ISOTHERMAL ATMOSPHERE

被引：88
作者：
Crossfield, Ian J. M. [1 ,2 ]
Barman, Travis [3 ]
Hansen, Brad M. S. [2 ]
Tanaka, Ichi [4 ]
Kodama, Tadayuki [4 ]
机构：
[1] Max Planck Inst Astron, D-69117 Heidelberg, Germany
[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[3] Lowell Observ, Flagstaff, AZ 86001 USA
[4] Natl Inst Nat Sci, Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA
来源：
ASTROPHYSICAL JOURNAL | 2012年 / 760卷 / 02期
关键词：
eclipses; infrared: planetary systems; stars:; individual; (WASP-12; Bergfors-6); techniques: photometric; techniques: spectroscopic; MULTIOBJECT INFRARED CAMERA; THERMAL EMISSION; TRANSMISSION SPECTRUM; EXTRASOLAR PLANET; HOST STARS; HD; 189733B; EXOPLANET WASP-12B; MODEL ATMOSPHERES; SECONDARY ECLIPSE; TIDAL INFLATION;
D O I：
10.1088/0004-637X/760/2/140
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We revisit the atmospheric properties of the extremely hot Jupiter WASP-12b in light of several new developments. First, we present new narrowband (2.315 mu m) secondary eclipse photometry, which exhibits a planet/star flux ratio of 0.45% +/- 0.06%, corresponding to a brightness temperature of 3640 +/- 230 K; second, recent Spitzer/Infrared Array Camera and Hubble Space Telescope/Wide Field Camera 3 observations; and third, a recently observed star only 1 '' from WASP-12, which has diluted previous observations and which we further characterize here. We correct past WASP-12b eclipse measurements for the presence of this object, and we revisit the interpretation of WASP-12b's dilution-corrected emission spectrum. The resulting planetary emission spectrum is well approximated by a blackbody, and consequently our primary conclusion is that the planet's infrared photosphere is nearly isothermal. Thus, secondary eclipse spectroscopy is relatively ill suited to constrain WASP-12b's atmospheric abundances, and transmission spectroscopy may be necessary to achieve this goal.
引用
收藏
页数：16
相关论文
共 89 条
[1]   OBLIQUITIES OF HOT JUPITER HOST STARS: EVIDENCE FOR TIDAL INTERACTIONS AND PRIMORDIAL MISALIGNMENTS [J].
Albrecht, Simon ;
Winn, Joshua N. ;
Johnson, John A. ;
Howard, Andrew W. ;
Marcy, Geoffrey W. ;
Butler, R. Paul ;
Arriagada, Pamela ;
Crane, Jeffrey D. ;
Shectman, Stephen A. ;
Thompson, Ian B. ;
Hirano, Teruyuki ;
Bakos, Gaspar ;
Hartman, Joel D. .
ASTROPHYSICAL JOURNAL, 2012, 757 (01)
[2]  
Allard F., 2011, ASP Conf. Ser. 448, XVI Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, V448, P91, DOI [10.48550/arXiv.1011.5405, DOI 10.48550/ARXIV.1011.5405]
[3]   The Chemical Composition of the Sun [J].
Asplund, Martin ;
Grevesse, Nicolas ;
Sauval, A. Jacques ;
Scott, Pat .
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 47, 2009, 47 :481-522
[4]   LOW-RESOLUTION SPECTRAL TEMPLATES FOR ACTIVE GALACTIC NUCLEI AND GALAXIES FROM 0.03 TO 30 μm [J].
Assef, R. J. ;
Kochanek, C. S. ;
Brodwin, M. ;
Cool, R. ;
Forman, W. ;
Gonzalez, A. H. ;
Hickox, R. C. ;
Jones, C. ;
Le Floc'h, E. ;
Moustakas, J. ;
Murray, S. S. ;
Stern, D. .
ASTROPHYSICAL JOURNAL, 2010, 713 (02) :970-985
[5]   NON-LTE CO, REVISITED [J].
AYRES, TR ;
WIEDEMANN, GR .
ASTROPHYSICAL JOURNAL, 1989, 338 (02) :1033-1046
[6]   Irradiated planets [J].
Barman, TAS ;
Hauschildt, PH ;
Allard, F .
ASTROPHYSICAL JOURNAL, 2001, 556 (02) :885-895
[7]   Phase-dependent properties of extrasolar planet atmospheres [J].
Barman, TS ;
Hauschildt, PH ;
Allard, F .
ASTROPHYSICAL JOURNAL, 2005, 632 (02) :1132-1139
[8]   Non-LTE effects of Na I in the atmosphere of HD 209458b [J].
Barman, TS ;
Hauschildt, PH ;
Schweitzer, A ;
Stancil, PC ;
Baron, E ;
Allard, F .
ASTROPHYSICAL JOURNAL, 2002, 569 (01) :L51-L54
[9]   Near-infrared spectroscopic search for the close orbiting planet HD 75289b [J].
Barnes, J. R. ;
Leigh, C. J. ;
Jones, H. R. A. ;
Barman, Travis S. ;
Pinfield, D. J. ;
Cameron, A. Collier ;
Jenkins, J. S. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 379 (03) :1097-1107
[10]   A ground-based transmission spectrum of the super-Earth exoplanet GJ 1214b [J].
Bean, Jacob L. ;
Kempton, Eliza Miller-Ricci ;
Homeier, Derek .
NATURE, 2010, 468 (7324) :669-672
123456789