HST PanCET programme: a flat optical transmission spectrum for the Hot Jupiter WASP-101b

Alexander D Rathcke; Lars A Buchhave; João M Mendonça; David K Sing; Mercedes López-Morales; Munazza K Alam; Gregory W Henry; Nikolay K Nikolov; A García muñoz; Thomas Mikal-Evans; Hannah R Wakeford; Leonardo A Dos santos; Vinesh Maguire Rajpaul

doi:10.1093/mnras/stad1010

HST PanCET programme: a flat optical transmission spectrum for the Hot Jupiter WASP-101b

Alexander D Rathcke^*, Lars A Buchhave, João M Mendonça, David K Sing, Mercedes López-Morales, Munazza K Alam, Gregory W Henry, Nikolay K Nikolov, A García muñoz, Thomas Mikal-Evans, Hannah R Wakeford, Leonardo A Dos santos, Vinesh Maguire Rajpaul

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article (Academic Journal) › peer-review

3 Citations (Scopus)

Abstract

We present an optical transmission spectrum of the hot Jupiter WASP-101b. We observed three primary transits with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph, covering a wavelength range from 0.3 to 1 μm. The observations suffer from significant systematics that we model using Gaussian Processes. Kernel selection for the Gaussian Processes is performed in a data-driven approach through Bayesian model comparison. We find a flat and featureless transmission spectrum, corroborating a previous measurement obtained with HST/Wide-Field Camera 3 in the 1–1.7 μm range. The spectrum is consistent with high-altitude clouds located at less than 100 μbar. This cloud layer completely blocks our view into deeper parts of the atmosphere and makes WASP-101b the cloudiest gas giant observed so far. We compute a series of temperature-pressure profiles for WASP-101b and compare these to condensation curves for cloud particles, which match clouds composed of silicates. We also include 13 transits observed with Transiting Exoplanet Survey Satellite and use these to refine system parameters.

Original language	English
Article number	stad1010
Pages (from-to)	582-594
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	522
Issue number	1
Early online date	6 Apr 2023
DOIs	https://doi.org/10.1093/mnras/stad1010
Publication status	Published - 1 Jun 2023

Bibliographical note

Funding Information:
GWH acknowledges that Astronomy at Tennessee State University is supported by the State of Tennessee through its Centers of Excellence Program.

Publisher Copyright:
© 2023 The Author(s).

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Rathcke, A. D., Buchhave, L. A., Mendonça, J. M., Sing, D. K., López-Morales, M., Alam, M. K., Henry, G. W., Nikolov, N. K., García muñoz, A., Mikal-Evans, T., Wakeford, H. R., Dos santos, L. A., & Rajpaul, V. M. (2023). HST PanCET programme: a flat optical transmission spectrum for the Hot Jupiter WASP-101b . Monthly Notices of the Royal Astronomical Society, 522(1), 582-594. Article stad1010. https://doi.org/10.1093/mnras/stad1010

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title = "HST PanCET programme: a flat optical transmission spectrum for the Hot Jupiter WASP-101b ",

abstract = "We present an optical transmission spectrum of the hot Jupiter WASP-101b. We observed three primary transits with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph, covering a wavelength range from 0.3 to 1 μm. The observations suffer from significant systematics that we model using Gaussian Processes. Kernel selection for the Gaussian Processes is performed in a data-driven approach through Bayesian model comparison. We find a flat and featureless transmission spectrum, corroborating a previous measurement obtained with HST/Wide-Field Camera 3 in the 1–1.7 μm range. The spectrum is consistent with high-altitude clouds located at less than 100 μbar. This cloud layer completely blocks our view into deeper parts of the atmosphere and makes WASP-101b the cloudiest gas giant observed so far. We compute a series of temperature-pressure profiles for WASP-101b and compare these to condensation curves for cloud particles, which match clouds composed of silicates. We also include 13 transits observed with Transiting Exoplanet Survey Satellite and use these to refine system parameters.",

author = "Rathcke, {Alexander D} and Buchhave, {Lars A} and Mendon{\c c}a, {Jo{\~a}o M} and Sing, {David K} and Mercedes L{\'o}pez-Morales and Alam, {Munazza K} and Henry, {Gregory W} and Nikolov, {Nikolay K} and A Garc{\'i}a mu{\~n}oz and Thomas Mikal-Evans and Wakeford, {Hannah R} and Dos santos, {Leonardo A} and Rajpaul, {Vinesh Maguire}",

note = "Funding Information: GWH acknowledges that Astronomy at Tennessee State University is supported by the State of Tennessee through its Centers of Excellence Program. Publisher Copyright: {\textcopyright} 2023 The Author(s).",

year = "2023",

month = jun,

day = "1",

doi = "10.1093/mnras/stad1010",

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Rathcke, AD, Buchhave, LA, Mendonça, JM, Sing, DK, López-Morales, M, Alam, MK, Henry, GW, Nikolov, NK, García muñoz, A, Mikal-Evans, T, Wakeford, HR, Dos santos, LA & Rajpaul, VM 2023, 'HST PanCET programme: a flat optical transmission spectrum for the Hot Jupiter WASP-101b ', Monthly Notices of the Royal Astronomical Society, vol. 522, no. 1, stad1010, pp. 582-594. https://doi.org/10.1093/mnras/stad1010

TY - JOUR

T1 - HST PanCET programme

T2 - a flat optical transmission spectrum for the Hot Jupiter WASP-101b

AU - Rathcke, Alexander D

AU - Buchhave, Lars A

AU - Mendonça, João M

AU - Sing, David K

AU - López-Morales, Mercedes

AU - Alam, Munazza K

AU - Henry, Gregory W

AU - Nikolov, Nikolay K

AU - García muñoz, A

AU - Mikal-Evans, Thomas

AU - Wakeford, Hannah R

AU - Dos santos, Leonardo A

AU - Rajpaul, Vinesh Maguire

N1 - Funding Information: GWH acknowledges that Astronomy at Tennessee State University is supported by the State of Tennessee through its Centers of Excellence Program. Publisher Copyright: © 2023 The Author(s).

PY - 2023/6/1

Y1 - 2023/6/1

N2 - We present an optical transmission spectrum of the hot Jupiter WASP-101b. We observed three primary transits with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph, covering a wavelength range from 0.3 to 1 μm. The observations suffer from significant systematics that we model using Gaussian Processes. Kernel selection for the Gaussian Processes is performed in a data-driven approach through Bayesian model comparison. We find a flat and featureless transmission spectrum, corroborating a previous measurement obtained with HST/Wide-Field Camera 3 in the 1–1.7 μm range. The spectrum is consistent with high-altitude clouds located at less than 100 μbar. This cloud layer completely blocks our view into deeper parts of the atmosphere and makes WASP-101b the cloudiest gas giant observed so far. We compute a series of temperature-pressure profiles for WASP-101b and compare these to condensation curves for cloud particles, which match clouds composed of silicates. We also include 13 transits observed with Transiting Exoplanet Survey Satellite and use these to refine system parameters.

AB - We present an optical transmission spectrum of the hot Jupiter WASP-101b. We observed three primary transits with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph, covering a wavelength range from 0.3 to 1 μm. The observations suffer from significant systematics that we model using Gaussian Processes. Kernel selection for the Gaussian Processes is performed in a data-driven approach through Bayesian model comparison. We find a flat and featureless transmission spectrum, corroborating a previous measurement obtained with HST/Wide-Field Camera 3 in the 1–1.7 μm range. The spectrum is consistent with high-altitude clouds located at less than 100 μbar. This cloud layer completely blocks our view into deeper parts of the atmosphere and makes WASP-101b the cloudiest gas giant observed so far. We compute a series of temperature-pressure profiles for WASP-101b and compare these to condensation curves for cloud particles, which match clouds composed of silicates. We also include 13 transits observed with Transiting Exoplanet Survey Satellite and use these to refine system parameters.

U2 - 10.1093/mnras/stad1010

DO - 10.1093/mnras/stad1010

M3 - Article (Academic Journal)

SN - 0035-8711

VL - 522

SP - 582

EP - 594

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

M1 - stad1010

ER -

HST PanCET programme: a flat optical transmission spectrum for the Hot Jupiter WASP-101b

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