Detection of transits of the nearby hot Neptune GJ 436 b

被引：231

作者：

Gillon, M. ^{[1
]}

Pont, F.

Demory, B.-O.

Mallmann, F.

Mayor, M.

Mazeh, T.

Queloz, D.

Shporer, A.

Udry, S.

Vuissoz, C.

机构：

[1] Univ Geneva, Observ Geneva, CH-1290 Sauverny, Switzerland

[2] Univ Liege, Inst Astrophys & Geophys, B-4000 Liege, Belgium

[3] Observ Francois Xavier Bagnoud OFXB, CH-3961 St Luc, Switzerland

[4] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[5] EPFL, Astrophys Lab, CH-1290 Sauverny, Switzerland

来源：

ASTRONOMY & ASTROPHYSICS | 2007年 / 472卷 / 02期

关键词：

stars : planetary systems; stars : individual : GJ 436; techniques : photometric;

D O I：

10.1051/0004-6361:20077799

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This Letter reports on the photometric detection of transits of the Neptune-mass planet orbiting the nearby M-dwarf star GJ 436. It is by far the closest, smallest, and least massive transiting planet detected so far. Its mass is slightly larger than Neptune's at M = 22.6 +/- 1.9 M-circle plus. The shape and depth of the transit lightcurves show that it is crossing the host star disc near its limb (impact parameter 0.84 +/- 0.03) and that the planet size is comparable to that of Uranus and Neptune, R = 25 200 +/- 2200 km = 3.95 +/- 0.35 R-circle plus. Its main constituant is therefore very likely to be water ice. If the current planet structure models are correct, an outer layer of H/He constituting up to ten percent in mass is probably needed on top of the ice to account for the observed radius.

引用

页码：L13 / L16

页数：4

共 20 条

[1]

[Anonymous], PASP

[2]

BAKOS GA, 2007, UNPUB APJ

[3]

Baraffe I, 1998, ASTRON ASTROPHYS, V337, P403

[4]

BUTLER P, 2004, APJ, V617, pL580

[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] Detection of an extrasolar planet atmosphere [J].

Charbonneau, D ;

Brown, TM ;

Noyes, RW ;

Gilliland, RL .

ASTROPHYSICAL JOURNAL, 2002, 568 (01) :377-384

[7]

CHARBONNEAU D, 2007, PROTOSTARTS PLANET V, V701

[8]

Claret A, 2000, ASTRON ASTROPHYS, V363, P1081

[9] A diagram to determine the evaporation status of extrasolar planets [J].

des Etangs, A. Lecavelier .

ASTRONOMY & ASTROPHYSICS, 2007, 461 (03) :1185-U115

[10] Planetary radii across five orders of magnitude in mass and stellar insolation: Application to transits [J].

Fortney, J. J. ;

Marley, M. S. ;

Barnes, J. W. .

ASTROPHYSICAL JOURNAL, 2007, 659 (02) :1661-1672

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