期刊
ASTRONOMY & ASTROPHYSICS
卷 643, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202038677
关键词
techniques: photometric; planets and satellites: atmospheres; planets and satellites: individual: WASP-189 b
资金
- Swiss Space Office (SSO)
- University of Bern
- NCCR PlanetS
- Swiss National Science Foundation
- Austrian Research Promotion Agency (FFG) [859724]
- DFG Research Unit 2440: 'Matter Under Planetary Interior Conditions: High Pressure, Planetary, and Plasma Physics'
- DFG [RA 714/14-1]
- European Research Council (ERC) under European Union [724427, 833925]
- Swiss National Fund [200020_172746]
- Spanish Ministry of Science and Innovation
- European Regional Development Fund [ESP2016-80435-C2-1-R, ESP2016-80435-C2-2-R, ESP2017-87676-C5-1-R, PGC2018-098153-B-C31, PGC2018-098153-B-C33]
- Unidad de Excelencia Maria de Maeztu-Centro de Astrobiologia (INTA-CSIC) [MDM-2017-0737]
- Generalitat de Catalunya/CERCA programme
- ESA [4000124370]
- FCT -Fundacao para a Ciencia e a Tecnologia
- FEDER through COMPETE2020 -Programa Operacional Competitividade e Internacionalizacao [UID/FIS/04434/2019, UIDB/04434/2020, UIDP/04434/2020, PTDC/FIS-AST/32113/2017, POCI-01-0145-FEDER-032113, PTDC/FIS-AST/28953/2017, POCI-01-0145-FEDER-028953, PTDC/FIS-AST/28987/2017, POCI-01-0145-FEDER-028987]
- FCT [IF/01312/2014/CP1215/CT0004, IF/00028/2014/CP1215/CT0002]
- Fundacao para a Ciencia e Tecnologia (FCT) [DL 57/2016/CP1364/CT0004]
- Belgian Federal Science Policy Office (BELSPO)
- University of Liege through ARC - Wallonia-Brussels Federation
- Hungarian National Research, Development and Innovation Office (NKFIH) [GINOP-2.3.2-15-2016-00003, K-119517]
- Italian Space Agency [2013-016-R.0, 2019-29-HH.0]
- CNES [124378, 837319]
- University of Geneva
- European Research Council (ERC) [833925, 724427] Funding Source: European Research Council (ERC)
- Swiss National Science Foundation (SNF) [200020_172746] Funding Source: Swiss National Science Foundation (SNF)
The CHEOPS space mission dedicated to exoplanet follow-up was launched in December 2019, equipped with the capacity to perform photometric measurements at the 20 ppm level. As CHEOPS carries out its observations in a broad optical passband, it can provide insights into the reflected light from exoplanets and constrain the short-wavelength thermal emission for the hottest of planets by observing occultations and phase curves. Here, we report the first CHEOPS observation of an occultation, namely, that of the hot Jupiter WASP-189 b, a M-P approximate to 2M(J) planet orbiting an A-type star. We detected the occultation of WASP-189 b at high significance in individual measurements and derived an occultation depth of dF = 87.9 +/- 4.3 ppm based on four occultations. We compared these measurements to model predictions and we find that they are consistent with an unreflective atmosphere heated to a temperature of 3435 +/- 27 K, when assuming inefficient heat redistribution. Furthermore, we present two transits of WASP-189 b observed by CHEOPS. These transits have an asymmetric shape that we attribute to gravity darkening of the host star caused by its high rotation rate. We used these measurements to refine the planetary parameters, finding a similar to 25% deeper transit compared to the discovery paper and updating the radius of WASP-189 b to 1.619 +/- 0.021R(J). We further measured the projected orbital obliquity to be lambda = 86.4(-4.4)(+2.9)degrees, a value that is in good agreement with a previous measurement from spectroscopic observations, and derived a true obliquity of Psi = 85.4 +/- 4.3 degrees. Finally, we provide reference values for the photometric precision attained by the CHEOPS satellite: for the V = 6 :6 mag star, and using a 1-h binning, we obtain a residual RMS between 10 and 17 ppm on the individual light curves, and 5.7 ppm when combining the four visits.
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