WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system

M. Neveu-Vanmalle; D. Queloz; D.R. Anderson; C. Charbonnel; A. Collier Cameron; L. Delrez; M. Gillon; C. Hellier; E. Jehin; M. Lendl; P.F.L. Maxted; F. Pepe; D. Pollacco; D. Ségransan; B. Smalley; A.M.S. Smith; J. Southworth; A.H.M.J. Triaud; S. Udry; R.G. West

doi:10.1051/0004-6361/201424744

WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system

M. Neveu-Vanmalle, D. Queloz, D.R. Anderson, C. Charbonnel, A. Collier Cameron, L. Delrez, M. Gillon, C. Hellier, E. Jehin, M. Lendl, P.F.L. Maxted, F. Pepe, D. Pollacco, D. Ségransan, B. Smalley, A.M.S. Smith, J. Southworth, A.H.M.J. Triaud, S. Udry, R.G. West

School of Physics and Astronomy

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Abstract

We report the discovery of two hot-Jupiter planets, each orbiting one of the stars of a wide binary system. WASP-94A (2MASS 20550794–3408079) is an F8 type star hosting a transiting planet with a radius of 1.72 ± 0.06 R_Jup, a mass of 0.452 ± 0.034 M_Jup, and an orbital period of 3.95 days. The Rossiter-McLaughlin effect is clearly detected, and the measured projected spin-orbit angle indicates that the planet occupies a retrograde orbit. WASP-94B (2MASS 20550915–3408078) is an F9 stellar companion at an angular separation of 15′′ (projected separation 2700 au), hosting a gas giant with a minimum mass of 0.618 ± 0.028 M_Jup with a period of 2.008 days, detected by Doppler measurements. The orbital planes of the two planets are inclined relative to each other, indicating that at least one of them is inclined relative to the plane of the stellar binary. These hot Jupiters in a binary system bring new insights into the formation of close-in giant planets and the role of stellar multiplicity.

Original language	English
Article number	A49
Number of pages	5
Journal	Astronomy & Astrophysics
Volume	572
Early online date	26 Nov 2014
DOIs	https://doi.org/10.1051/0004-6361/201424744
Publication status	Published - Dec 2014

Keywords

Planetary systems
Stars: individual: WASP-94
Techniques: photometric
Techniques: radial velocities
Techniques: spectroscopic

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10.1051/0004-6361/201424744

Cameron_2014_A&A_WASP-94
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Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014
Horne, K. D. (PI)
Science & Technology Facilities Council
1/10/11 → 31/03/12
Project: Standard
PATT linked Travel and Subsistence: St Andrrews Astronomy PATT linked Travel and subsistence
Cameron, A. C. (PI), Driver, S. P. (CoI), Greaves, J. S. (CoI) & Horne, K. D. (CoI)
Science & Technology Facilities Council
1/10/10 → 30/09/13
Project: Standard
PATT Linked Travel ST/G001006/1: Patt Linked Travel & Subsistence
Cameron, A. C. (PI), Driver, S. P. (CoI), Greaves, J. S. (CoI) & Horne, K. D. (CoI)
Science & Technology Facilities Council
1/10/08 → 30/09/10
Project: Standard

Cite this

Neveu-Vanmalle, M., Queloz, D., Anderson, D. R., Charbonnel, C., Collier Cameron, A., Delrez, L., Gillon, M., Hellier, C., Jehin, E., Lendl, M., Maxted, P. F. L., Pepe, F., Pollacco, D., Ségransan, D., Smalley, B., Smith, A. M. S., Southworth, J., Triaud, A. H. M. J., Udry, S., & West, R. G. (2014). WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system. Astronomy & Astrophysics, 572, Article A49. https://doi.org/10.1051/0004-6361/201424744

@article{969d291c02c645fd8c95b5c036a9b597,

title = "WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system",

abstract = "We report the discovery of two hot-Jupiter planets, each orbiting one of the stars of a wide binary system. WASP-94A (2MASS 20550794–3408079) is an F8 type star hosting a transiting planet with a radius of 1.72 ± 0.06 RJup, a mass of 0.452 ± 0.034 MJup, and an orbital period of 3.95 days. The Rossiter-McLaughlin effect is clearly detected, and the measured projected spin-orbit angle indicates that the planet occupies a retrograde orbit. WASP-94B (2MASS 20550915–3408078) is an F9 stellar companion at an angular separation of 15′′ (projected separation 2700 au), hosting a gas giant with a minimum mass of 0.618 ± 0.028 MJup with a period of 2.008 days, detected by Doppler measurements. The orbital planes of the two planets are inclined relative to each other, indicating that at least one of them is inclined relative to the plane of the stellar binary. These hot Jupiters in a binary system bring new insights into the formation of close-in giant planets and the role of stellar multiplicity.",

keywords = "Planetary systems, Stars: individual: WASP-94, Techniques: photometric, Techniques: radial velocities, Techniques: spectroscopic",

author = "M. Neveu-Vanmalle and D. Queloz and D.R. Anderson and C. Charbonnel and {Collier Cameron}, A. and L. Delrez and M. Gillon and C. Hellier and E. Jehin and M. Lendl and P.F.L. Maxted and F. Pepe and D. Pollacco and D. S{\'e}gransan and B. Smalley and A.M.S. Smith and J. Southworth and A.H.M.J. Triaud and S. Udry and R.G. West",

note = "Funding for WASP comes from consortium universities and from the UK{\textquoteright}s Science and Technology Facilities Council. This work was supported by the European Research Council through the European Union{\textquoteright}s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement number 336480.",

year = "2014",

month = dec,

doi = "10.1051/0004-6361/201424744",

language = "English",

volume = "572",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

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Neveu-Vanmalle, M, Queloz, D, Anderson, DR, Charbonnel, C, Collier Cameron, A, Delrez, L, Gillon, M, Hellier, C, Jehin, E, Lendl, M, Maxted, PFL, Pepe, F, Pollacco, D, Ségransan, D, Smalley, B, Smith, AMS, Southworth, J, Triaud, AHMJ, Udry, S & West, RG 2014, 'WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system', Astronomy & Astrophysics, vol. 572, A49. https://doi.org/10.1051/0004-6361/201424744

TY - JOUR

T1 - WASP-94 A and B planets

T2 - hot-Jupiter cousins in a twin-star system

AU - Neveu-Vanmalle, M.

AU - Queloz, D.

AU - Anderson, D.R.

AU - Charbonnel, C.

AU - Collier Cameron, A.

AU - Delrez, L.

AU - Gillon, M.

AU - Hellier, C.

AU - Jehin, E.

AU - Lendl, M.

AU - Maxted, P.F.L.

AU - Pepe, F.

AU - Pollacco, D.

AU - Ségransan, D.

AU - Smalley, B.

AU - Smith, A.M.S.

AU - Southworth, J.

AU - Triaud, A.H.M.J.

AU - Udry, S.

AU - West, R.G.

N1 - Funding for WASP comes from consortium universities and from the UK’s Science and Technology Facilities Council. This work was supported by the European Research Council through the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement number 336480.

PY - 2014/12

Y1 - 2014/12

N2 - We report the discovery of two hot-Jupiter planets, each orbiting one of the stars of a wide binary system. WASP-94A (2MASS 20550794–3408079) is an F8 type star hosting a transiting planet with a radius of 1.72 ± 0.06 RJup, a mass of 0.452 ± 0.034 MJup, and an orbital period of 3.95 days. The Rossiter-McLaughlin effect is clearly detected, and the measured projected spin-orbit angle indicates that the planet occupies a retrograde orbit. WASP-94B (2MASS 20550915–3408078) is an F9 stellar companion at an angular separation of 15′′ (projected separation 2700 au), hosting a gas giant with a minimum mass of 0.618 ± 0.028 MJup with a period of 2.008 days, detected by Doppler measurements. The orbital planes of the two planets are inclined relative to each other, indicating that at least one of them is inclined relative to the plane of the stellar binary. These hot Jupiters in a binary system bring new insights into the formation of close-in giant planets and the role of stellar multiplicity.

AB - We report the discovery of two hot-Jupiter planets, each orbiting one of the stars of a wide binary system. WASP-94A (2MASS 20550794–3408079) is an F8 type star hosting a transiting planet with a radius of 1.72 ± 0.06 RJup, a mass of 0.452 ± 0.034 MJup, and an orbital period of 3.95 days. The Rossiter-McLaughlin effect is clearly detected, and the measured projected spin-orbit angle indicates that the planet occupies a retrograde orbit. WASP-94B (2MASS 20550915–3408078) is an F9 stellar companion at an angular separation of 15′′ (projected separation 2700 au), hosting a gas giant with a minimum mass of 0.618 ± 0.028 MJup with a period of 2.008 days, detected by Doppler measurements. The orbital planes of the two planets are inclined relative to each other, indicating that at least one of them is inclined relative to the plane of the stellar binary. These hot Jupiters in a binary system bring new insights into the formation of close-in giant planets and the role of stellar multiplicity.

KW - Planetary systems

KW - Stars: individual: WASP-94

KW - Techniques: photometric

KW - Techniques: radial velocities

KW - Techniques: spectroscopic

U2 - 10.1051/0004-6361/201424744

DO - 10.1051/0004-6361/201424744

M3 - Article

AN - SCOPUS:84913596571

SN - 0004-6361

VL - 572

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A49

ER -

WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system

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Keywords

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Projects

Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014

PATT linked Travel and Subsistence: St Andrrews Astronomy PATT linked Travel and subsistence

PATT Linked Travel ST/G001006/1: Patt Linked Travel & Subsistence

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