2015A&A...580A..60M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET01:51:04

2015A&A...580A..60M - Astronomy and Astrophysics, volume 580A, 60-60 (2015/8-1)

Transmission spectroscopy of the inflated exo-Saturn HAT-P-19b.

MALLONN M., VON ESSEN C., WEINGRILL J., STRASSMEIER K.G., RIBAS I., CARROLL T.A., HERRERO E., GRANZER T., CLARET A. and SCHWOPE A.

Abstract (from CDS):

Transiting highly inflated giant planets offer the possibility of characterizing their atmospheres. A fraction of the starlight passes through the high-altitude layers of the planetary atmosphere during transit. The resulting absorption is expected to be wavelength dependent for cloud-free atmospheres with an amplitude of up to 10–3 of the stellar flux, while a high-altitude cloud deck would cause a gray opacity. We observed the Saturn-mass and Jupiter-sized exoplanet HAT-P-19b to refine its transit parameters and ephemeris as well as to shed first light on its transmission spectrum. We monitored the host star over one year to quantify its flux variability and to correct the transmission spectrum for a slope caused by starspots. A transit of HAT-P-19b was observed spectroscopically with OSIRIS at the Gran Telescopio Canarias in January 2012. The spectra of the target and the comparison star covered the wavelength range from 5600 to 7600Å. One high-precision differential light curve was created by integrating the entire spectral flux. This white-light curve was used to derive absolute transit parameters. Furthermore, a set of light curves over wavelength was formed by a flux integration in 41 wavelength channels of 50Å width. We analyzed these spectral light curves for chromatic variations of transit depth. The transit fit of the combined white-light curve yields a refined value of the planet-to-star radius ratio of 0.1390±0.0012 and an inclination of 88.89±0.32deg. After a re-analysis of published data, we refine the orbital period to 4.0087844±0.0000015-days. We obtain a flat transmission spectrum without significant additional absorption at any wavelength or any slope. However, our accuracy is not sufficient to significantly rule out the presence of a pressure-broadened sodium feature. Our photometric monitoring campaign allowed for an estimate of the stellar rotation period of 35.5±2.5-days and an improved age estimate of 5.5+1.8–1.3Gyr by gyrochronology. The calculated correction of the transit depth for unocculted spots on the visible hemisphere was found to be well within the derived 1σ uncertainty of the white-light curve and the spectral data points of the transmission spectrum.

Abstract Copyright:

Journal keyword(s): planetary systems - planets and satellites: atmospheres - starspots - stars: individual: HAT-P-19 - techniques: spectroscopic

CDS comments: HD 29458b is a misprint for HD 209458b.

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HAT-P-19b Pl 00 38 04.0136161838 +34 42 41.552260901           ~ 47 1
2 HAT-P-19 * 00 38 04.0136161838 +34 42 41.552260901   12.4   12.82   K1V 26 1
3 GSC 02283-01197 * 00 38 09.3713498665 +34 41 37.190153969   13.96 12.78 12.54   ~ 2 0
4 HAT-P-32b Pl 02 04 10.2775457769 +46 41 16.210382751           ~ 95 1
5 WASP-12 ** 06 30 32.7966788910 +29 40 20.266334158   12.14 11.57     G0V 241 2
6 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 586 1
7 BD+50 1471 PM* 07 48 06.4726006390 +50 13 32.921121328   12.002 11.138 10.669 10.243 G9V 142 1
8 BD+50 1471b Pl 07 48 06.4726006390 +50 13 32.921121328           ~ 135 1
9 WASP-19b Pl 09 53 40.0764883458 -45 39 33.055979403           ~ 281 1
10 WASP-19 LP* 09 53 40.0764883458 -45 39 33.055979403   13.05 12.31 12.12 11.35 G8V 141 1
11 WASP-43b Pl 10 19 38.0089444408 -09 48 22.603103969           ~ 228 1
12 WASP-31 * 11 17 45.3578468391 -19 03 17.216528280   12.01 11.66 11.98   F: 45 1
13 WASP-31b Pl 11 17 45.3578468391 -19 03 17.216528280           ~ 95 1
14 HAT-P-12 PM* 13 57 33.4668502171 +43 29 36.602501754   12.6 12.84     K5 62 1
15 HAT-P-12b Pl 13 57 33.4668502171 +43 29 36.602501754           ~ 135 1
16 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 566 1
17 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K2V 745 1
18 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1152 1
19 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1549 1
20 BD+37 4734B PM* 22 57 46.8443014981 +38 40 30.355384717   10.82 9.87     G0V 145 1
21 NAME BD+37 4734Bb Pl 22 57 46.8443014981 +38 40 30.355384717           ~ 208 1
22 WASP-6b Pl 23 12 37.7368657624 -22 40 26.277489164           ~ 105 1
23 WASP-6 * 23 12 37.7368657624 -22 40 26.277489164   12.90 11.91     G8V 72 1
24 CD-40 15273b Pl 23 51 31.0840161955 -39 54 24.259966546           ~ 55 1

    Equat.    Gal    SGal    Ecl

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2021.03.03-01:51:04

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