CONFIRMATION OF A RETROGRADE ORBIT FOR EXOPLANET WASP-17b

被引：24

作者：

Bayliss, Daniel D. R. ^{[1
]}

Winn, Joshua N. ^{[2
,3
]}

Mardling, Rosemary A. ^{[4
]}

Sackett, Penny D. ^{[1
]}

机构：

[1] Australian Natl Univ, Mt Stromlo Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia

[2] MIT, Dept Phys, Cambridge, MA 02139 USA

[3] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[4] Monash Univ, Sch Math Sci, Clayton, Vic 3800, Australia

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 722卷 / 02期

关键词：

planets and satellites: dynamical evolution and stability; planets and satellites: individual (WASP-17b); stars: individual (WASP-17); techniques: radial velocities; TRANSITING EXOPLANETS; SPIN; ALIGNMENT; PLANET; ROTATION; VELOCITY; STARS;

D O I：

10.1088/2041-8205/722/2/L224

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present high-precision radial velocity observations of WASP-17 throughout the transit of its close-in giant planet, using the MIKE spectrograph on the 6.5 m Magellan Telescope at Las Campanas Observatory. By modeling the Rossiter-McLaughlin effect, we find the sky-projected spin-orbit angle to be lambda = 167.4 +/- 11.2 deg. This independently confirms the previous finding that WASP-17b is on a retrograde orbit, suggesting it underwent migration via a mechanism other than just the gravitational interaction between the planet and the disk. Interestingly, our result for lambda differs by 45 +/- 13 deg from the previously announced value, and we also find that the spectroscopic transit occurs 15 +/- 5 minutes earlier than expected, based on the published ephemeris. The discrepancy in the ephemeris highlights the need for contemporaneous spectroscopic and photometric transit observations whenever possible.

引用

页码：L224 / L227

页数：4

共 29 条

[1] Misaligned spin and orbital axes cause the anomalous precession of DI Herculis [J].

Albrecht, Simon ;

Reffert, Sabine ;

Snellen, Ignas A. G. ;

Winn, Joshua N. .

NATURE, 2009, 461 (7262) :373-376

[2] WASP-17b: AN ULTRA-LOW DENSITY PLANET IN A PROBABLE RETROGRADE ORBIT [J].

Anderson, D. R. ;

Hellier, C. ;

Gillon, M. ;

Triaud, A. H. M. J. ;

Smalley, B. ;

Hebb, L. ;

Cameron, A. Collier ;

Maxted, P. F. L. ;

Queloz, D. ;

West, R. G. ;

Bentley, S. J. ;

Enoch, B. ;

Horne, K. ;

Lister, T. A. ;

Mayor, M. ;

Parley, N. R. ;

Pepe, F. ;

Pollacco, D. ;

Segransan, D. ;

Udry, S. ;

Wilson, D. M. .

ASTROPHYSICAL JOURNAL, 2010, 709 (01) :159-167

[3]

BAKOS G, 2009, IAU S, V253, P354, DOI [10.1017/S174392130802663X, DOI 10.1017/S174392130802663X]

[4] Chaotic star formation and the alignment of stellar rotation with disc and planetary orbital axes [J].

Bate, M. R. ;

Lodato, G. ;

Pringle, J. E. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 401 (03) :1505-1513

[5] WASP-1b and WASP-2b:: two new transiting exoplanets detected with SuperWASP and SOPHIE [J].

Cameron, A. Collier ;

Bouchy, F. ;

Hebrard, G. ;

Maxted, P. ;

Pollacco, D. ;

Pont, F. ;

Skillen, I. ;

Smalley, B. ;

Street, R. A. ;

West, R. G. ;

Wilson, D. M. ;

Aigrain, S. ;

Christian, D. J. ;

Clarkson, W. I. ;

Enoch, B. ;

Evans, A. ;

Fitzsimmons, A. ;

Fleenor, M. ;

Gillon, M. ;

Haswell, C. A. ;

Hebb, L. ;

Hellier, C. ;

Hodgkin, S. T. ;

Horne, K. ;

Irwin, J. ;

Kane, S. R. ;

Keenan, F. P. ;

Loeillet, B. ;

Lister, T. A. ;

Mayor, M. ;

Moutou, C. ;

Norton, A. J. ;

Osborne, J. ;

Parley, N. ;

Queloz, D. ;

Ryans, R. ;

Triaud, A. H. M. J. ;

Udry, S. ;

Wheatley, P. J. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 375 (03) :951-957

[6] Line-profile tomography of exoplanet transits - I. The Doppler shadow of HD 189733b [J].

Cameron, A. Collier ;

Bruce, V. A. ;

Miller, G. R. M. ;

Triaud, A. H. M. J. ;

Queloz, D. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 403 (01) :151-158

[7] PLATO: PLAnetary Transits and Oscillations of stars [J].

Catala, Claude .

PROCEEDINGS OF THE SECOND HELAS INTERNATIONAL CONFERENCE: HELIOSEISMOLOGY, ASTEROSEISMOLOGY AND MHD CONNECTIONS, 2008, 118

[8] Discovery and Characterization of Transiting Super Earths Using an All-Sky Transit Survey and Follow-up by the James Webb Space Telescope [J].

Deming, D. ;

Seager, S. ;

Winn, J. ;

Miller-Ricci, E. ;

Clampin, M. ;

Lindler, D. ;

Greene, T. ;

Charbonneau, D. ;

Laughlin, G. ;

Ricker, G. ;

Latham, D. ;

Ennico, K. .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2009, 121 (883) :952-967

[9] EXOPLANETARY SPIN-ORBIT ALIGNMENT: RESULTS FROM THE ENSEMBLE OF ROSSITER-MCLAUGHLIN OBSERVATIONS [J].

Fabrycky, Daniel C. ;

Winn, Joshua N. .

ASTROPHYSICAL JOURNAL, 2009, 696 (02) :1230-1240

[10]

FIGUEIRA P, 2010, ASTRON ASTROPHYS, V515, P106

← 1 2 3 →