J/A+A/575/A61 WASP-20b and WASP-28b photometry and RV (Anderson+, 2015)
WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits
around solar-type stars.
Anderson D.R., Collier Cameron A., Hellier C., Lendl M., Lister T.A.,
Maxted P.F.L., Queloz D., Smalley B., Smith A.M.S., Triaud A.H.M.J.,
Brown D.J.A., Gillon M., Neveu-VanMalle M., Pepe F., Pollacco D.,
Segransan D., Udry S., West R.G., Wheatley P.J.
<Astron. Astrophys. 575, A61 (2015)>
=2015A&A...575A..61A 2015A&A...575A..61A
ADC_Keywords: Binaries, eclipsing ; Stars, double and multiple ; Planets ;
Photometry ; Radial velocities
Keywords: planetary systems - stars: individual: WASP-20b -
stars: individual: WASP-28b
Abstract:
We report the discovery of the planets WASP-20b and WASP-28b along
with measurements of their sky-projected orbital obliquities. WASP-20b
is an inflated, Saturn-mass planet (0.31MJup; 1.46RJup) in a
4.9-day, near-aligned (lambda=12.7±4.2°) orbit around
CD-24 102 (V=10.7; F9). Due to the low density of the planet and the
apparent brightness of the host star, WASP-20 is a good target for
atmospheric characterisation via transmission spectroscopy. WASP-28b
is an inflated, Jupiter-mass planet (0.91MJup; 1.21RJup) in a
3.4-day, near-aligned (lambda=8±18°) orbit around a V=12, F8
star. As intermediate-mass planets in short orbits around aged, cool
stars (7+2-1Gyr and 6000±100K for WASP-20; 5+3-2Gyr and
6100±150K for WASP-28), their orbital alignment is consistent with
the hypothesis that close-in giant planets are scattered into
eccentric orbits with random alignments, which are then circularised
and aligned with their stars' spins via tidal dissipation.
Description:
Two tables of data on the two planet host stars are provided:
table2.dat is the radial-velocity measurements from CORALIE and HARPS;
table3.dat is the high-SNR photometry taken with FTN and EulerCam.
Objects:
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RA (2000) DE Designation(s) (Per)
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00 20 38.53 -23 56 08.6 WASP-20 = 2MASS J00203853-2356086 (4.8996285)
23 34 27.87 -01 34 48.2 WASP-28 = 2MASS J23342787-0134482 (3.4088300)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 57 178 CORALIE and HARPS radial velocities
table3.dat 61 1031 FTN and EulerCam photometry
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 I1 --- Set Index of dataset
3- 7 A5 --- --- [WASP-]
8- 9 I2 --- WASP [20,28] WASP star number (20 or 28)
12- 18 A7 d Spect Spectrograph (CORALIE or HARPS)
20- 30 F11.6 --- BJD Barycentric Julian Date (UTC) at mid-exposure
(BJD-2450000)
33- 40 F8.5 km/s RV [1.2/24.4] Radial velocity
42- 48 F7.5 km/s e_RV [0.001/0.065] Error on radial velocity
50- 57 F8.5 km/s BSpan [-0.05/0.16] Bisector Span
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1 I1 --- Set Index of dataset
3- 7 A5 --- --- [WASP-]
8- 9 I2 --- WASP [20,28] WASP star number (20 or 28)
12- 19 A8 --- Imager Imager name (EulerCam or FTN)
21- 28 A8 --- Filter Filter (Gunn-r or Sloan-z')
33- 43 F11.6 d BJD Barycentric Julian Date (UTC) at mid-exposure
(BJD-2450000)
45- 52 F8.6 --- NFlux [0.978/1.007] Normalised flux
54- 61 F8.6 --- e_NFlux [0.0005/0.0037] Normalised flux error
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Acknowledgements:
David R. Anderson, d.r.anderson(at)keele.ac.uk
(End) Patricia Vannier [CDS] 17-Feb-2015