Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Constraining the reflective properties of WASP-178 b using CHEOPS photometry

Pagano, I. ; Davies, M.B. LU and Walton, N.A. (2024) In Astronomy and Astrophysics 682.
Abstract
Context. Multiwavelength photometry of the secondary eclipses of extrasolar planets is able to disentangle the reflected and thermally emitted light radiated from the planetary dayside. Based on this, we can measure the planetary geometric albedo Ag, which is an indicator of the presence of clouds in the atmosphere, and the recirculation efficiency ϵ, which quantifies the energy transport within the atmosphere. Aims. We measure Ag and ϵ for the planet WASP-178 b, a highly irradiated giant planet with an estimated equilibrium temperature of 2450 K. Methods. We analyzed archival spectra and the light curves collected by CHEOPS and TESS to characterize the host WASP-178, refine the ephemeris of the system, and measure the eclipse depth in the... (More)
Context. Multiwavelength photometry of the secondary eclipses of extrasolar planets is able to disentangle the reflected and thermally emitted light radiated from the planetary dayside. Based on this, we can measure the planetary geometric albedo Ag, which is an indicator of the presence of clouds in the atmosphere, and the recirculation efficiency ϵ, which quantifies the energy transport within the atmosphere. Aims. We measure Ag and ϵ for the planet WASP-178 b, a highly irradiated giant planet with an estimated equilibrium temperature of 2450 K. Methods. We analyzed archival spectra and the light curves collected by CHEOPS and TESS to characterize the host WASP-178, refine the ephemeris of the system, and measure the eclipse depth in the passbands of the two telescopes. Results. We measured a marginally significant eclipse depth of 70 ± 40 ppm in the TESS passband, and a statistically significant depth of 70 ± 20 ppm in the CHEOPS passband. Conclusions. Combining the eclipse-depth measurement in the CHEOPS (λeff = 6300 Å) and TESS (λeff = 8000 Å) passbands, we constrained the dayside brightness temperature of WASP-178 b in the 2250-2800 K interval. The geometric albedo 0.1< Ag0.7 makes WASP-178 b an interesting laboratory for testing the current heat-recirculation models. © The Authors 2024. (Less)
Please use this url to cite or link to this publication:
author
; and
author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
planets and satellites: atmospheres, planets and satellites: detection, planets and satellites: gaseous planets, planets and satellites: individual: wasp-178 b, techniques: photometric, Exoplanets, Satellites, Solar radiation, Geometric albedos, Pass bands, Planet and satellite: gaseous planet, Planet and satellite: individual: wasp-178 b, Planets and satellites, Planets and satellites: atmospheres, Planets and satellites: detections, Planets and satellites: individual, Recirculations, Techniques: photometric, Photometry
in
Astronomy and Astrophysics
volume
682
article number
A102
publisher
EDP Sciences
external identifiers
  • scopus:85185216038
ISSN
0004-6361
DOI
10.1051/0004-6361/202346705
language
English
LU publication?
yes
id
ddffaeec-a309-48be-bc03-27e44e47bf3a
date added to LUP
2024-03-28 14:33:20
date last changed
2024-03-28 14:34:14
@article{ddffaeec-a309-48be-bc03-27e44e47bf3a,
  abstract     = {{Context. Multiwavelength photometry of the secondary eclipses of extrasolar planets is able to disentangle the reflected and thermally emitted light radiated from the planetary dayside. Based on this, we can measure the planetary geometric albedo Ag, which is an indicator of the presence of clouds in the atmosphere, and the recirculation efficiency ϵ, which quantifies the energy transport within the atmosphere. Aims. We measure Ag and ϵ for the planet WASP-178 b, a highly irradiated giant planet with an estimated equilibrium temperature of 2450 K. Methods. We analyzed archival spectra and the light curves collected by CHEOPS and TESS to characterize the host WASP-178, refine the ephemeris of the system, and measure the eclipse depth in the passbands of the two telescopes. Results. We measured a marginally significant eclipse depth of 70 ± 40 ppm in the TESS passband, and a statistically significant depth of 70 ± 20 ppm in the CHEOPS passband. Conclusions. Combining the eclipse-depth measurement in the CHEOPS (λeff = 6300 Å) and TESS (λeff = 8000 Å) passbands, we constrained the dayside brightness temperature of WASP-178 b in the 2250-2800 K interval. The geometric albedo 0.1&lt; Ag0.7 makes WASP-178 b an interesting laboratory for testing the current heat-recirculation models. © The Authors 2024.}},
  author       = {{Pagano, I. and Davies, M.B. and Walton, N.A.}},
  issn         = {{0004-6361}},
  keywords     = {{planets and satellites: atmospheres; planets and satellites: detection; planets and satellites: gaseous planets; planets and satellites: individual: wasp-178 b; techniques: photometric; Exoplanets; Satellites; Solar radiation; Geometric albedos; Pass bands; Planet and satellite: gaseous planet; Planet and satellite: individual: wasp-178 b; Planets and satellites; Planets and satellites: atmospheres; Planets and satellites: detections; Planets and satellites: individual; Recirculations; Techniques: photometric; Photometry}},
  language     = {{eng}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{Constraining the reflective properties of WASP-178 b using CHEOPS photometry}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202346705}},
  doi          = {{10.1051/0004-6361/202346705}},
  volume       = {{682}},
  year         = {{2024}},
}