Three newly discovered sub-Jupiter-mass planets: WASP-69b and WASP-84b transit active K dwarfs and WASP-70Ab transits the evolved primary of a G4+K3 binary

被引：93

作者：

Anderson, D. R. ^{[1
]}

Cameron, A. Collier ^{[2
]}

Delrez, L. ^{[3
]}

Doyle, A. P. ^{[1
]}

Faedi, F. ^{[4
]}

Fumel, A. ^{[3
]}

Gillon, M. ^{[3
]}

Chew, Y. Gomez Maqueo ^{[4
]}

Hellier, C. ^{[1
]}

Jehin, E. ^{[3
]}

Lendl, M. ^{[5
]}

Maxted, P. F. L. ^{[1
]}

Pepe, F. ^{[5
]}

Pollacco, D. ^{[4
]}

Queloz, D. ^{[5
,6
]}

Segransan, D. ^{[5
]}

Skillen, I. ^{[7
]}

Smalley, B. ^{[1
]}

Smith, A. M. S. ^{[1
,8
]}

Southworth, J. ^{[1
]}

Triaud, A. H. M. J. ^{[5
,9
,10
]}

Turner, O. D. ^{[1
]}

Udry, S. ^{[5
]}

West, R. G. ^{[4
]}

机构：

[1] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England

[2] Univ St Andrews, Sch Phys & Astron, SUPA, North Haugh KY16 9SS, Fife, Scotland

[3] Univ Liege, Inst Astrophys & Geophys, Liege 1, Belgium

[4] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

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

[6] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[7] Isaac Newton Grp Telescopes, E-38700 Tenerife, Spain

[8] Polish Acad Sci, N Copernicus Astron Ctr, PL-00716 Warsaw, Poland

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

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

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 445卷 / 02期

基金：

瑞士国家科学基金会; 英国科学技术设施理事会;

关键词：

techniques: photometric; techniques: radial velocities; planets and satellites: detection; planets and satellites: individual: WASP-69b; planets and satellites: individual: WASP-70Ab; planets and satellites: individual: WASP-84b; STELLAR ATMOSPHERE MODELS; LIMB-DARKENING LAW; NO PLANET; PARAMETERS; STARS; EMISSION; ROTATION; EVAPORATION; ALGORITHM; EVOLUTION;

D O I：

10.1093/mnras/stu1737

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of the transiting exoplanets WASP-69b, WASP-70Ab and WASP84b, each of which orbits a bright star (V similar to 10). WASP-69b is a bloated Saturn-mass planet (0.26 M-Jup, 1.06 R-Jup) in a 3.868-d period around an active, similar to 1-Gyr, mid-K dwarf. ROSAT detected X-rays 60 +/- 27 arcsec from WASP-69. If the star is the source then the planet could be undergoing mass-loss at a rate of similar to 10(12) g s(-1). This is one to two orders of magnitude higher than the evaporation rate estimated for HD 209458b and HD 189733b, both of which have exhibited anomalously large Lyman alpha absorption during transit. WASP-70Ab is a sub-Jupiter-mass planet (0.59 M-Jup, 1.16 R-Jup) in a 3.713-d orbit around the primary of a spatially resolved, 9-10-Gyr, G4+K3 binary, with a separation of 3.3 arcsec (>= 800 au). WASP-84b is a sub-Jupiter-mass planet (0.69 M-Jup, 0.94 R-Jup) in an 8.523-d orbit around an active, similar to 1-Gyr, early-K dwarf. Of the transiting planets discovered from the ground to date, WASP-84b has the third-longest period. For the active stars WASP-69 and WASP-84, we pre-whitened the radial velocities using a low-order harmonic series. We found that this reduced the residual scatter more than did the oft-used method of pre-whitening with a fit between residual radial velocity and bisector span. The system parameters were essentially unaffected by pre-whitening.

引用

页码：1114 / 1129

页数：16