ExoGemS high-resolution transmission spectroscopy of WASP-76b with GRACES

Emily K. Deibert; Ernst J. W. de Mooij; Ray Jayawardhana; Jake D. Turner; Andrew Ridden-Harper; Callie E. Hood; Jonathan J. Fortney; Laura Flagg; Luca Fossati; Romain Allart; Matteo Brogi; Ryan J. MacDonald

doi:10.3847/1538-3881/acebdc

ExoGemS high-resolution transmission spectroscopy of WASP-76b with GRACES

Emily K. Deibert^*
, Ernst J. W. de Mooij
, Ray Jayawardhana
, Jake D. Turner
, Andrew Ridden-Harper
, Callie E. Hood
, Jonathan J. Fortney
, Laura Flagg
, Luca Fossati
, Romain Allart
, Matteo Brogi
, Ryan J. MacDonald

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

We present high-resolution transmission spectroscopy of WASP-76b with Gemini Remote Access to CFHT ESPaDOnS Spectrograph (GRACES)/Gemini North obtained as part of the ExoGemS survey. With a broad spectral range of 400–1050 nm and a relatively high resolution of ∼66,000, these observations are particularly well suited to searching for atomic and molecular atmospheric species via the Doppler cross-correlation technique. We recover absorption features due to neutral iron (Fe i), sodium (Na i), and ionized calcium (Ca ii) at high significance (>5σ), and investigate possible atmospheric temperatures and wind speeds. We also report tentative (>3σ) detections of Li i, K i, Cr i, and V i in the atmosphere of WASP-76b. Finally, we report nondetections of a number of other species, some of which have previously been detected with other instruments. Through model injection/recovery tests, we demonstrate that many of these species are not expected to be detected in our observations. These results allow us to place GRACES and the ExoGemS survey in context with other high-resolution optical spectrographs.

Original language	English
Article number	141
Journal	Astronomical Journal
Volume	166
Issue number	4
Early online date	04 Sept 2023
DOIs	https://doi.org/10.3847/1538-3881/acebdc
Publication status	Published - 01 Oct 2023

Keywords

Exoplanets
Exoplanet atmospheric dynamics
Extrasolar gaseous giant planets
Exoplanet atmospheric composition
Hot Jupiters
Transmission spectroscopy
Exoplanet atmospheres

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10.3847/1538-3881/acebdcLicence: CC BY

ExoGemS high-resolution transmission spectroscopy of WASP-76b with GRACES
Copyright 2023 the authors. This is an open access article published under a Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Final published version, 11.4 MBLicence: CC BY

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title = "ExoGemS high-resolution transmission spectroscopy of WASP-76b with GRACES",

abstract = "We present high-resolution transmission spectroscopy of WASP-76b with Gemini Remote Access to CFHT ESPaDOnS Spectrograph (GRACES)/Gemini North obtained as part of the ExoGemS survey. With a broad spectral range of 400–1050 nm and a relatively high resolution of ∼66,000, these observations are particularly well suited to searching for atomic and molecular atmospheric species via the Doppler cross-correlation technique. We recover absorption features due to neutral iron (Fe i), sodium (Na i), and ionized calcium (Ca ii) at high significance (>5σ), and investigate possible atmospheric temperatures and wind speeds. We also report tentative (>3σ) detections of Li i, K i, Cr i, and V i in the atmosphere of WASP-76b. Finally, we report nondetections of a number of other species, some of which have previously been detected with other instruments. Through model injection/recovery tests, we demonstrate that many of these species are not expected to be detected in our observations. These results allow us to place GRACES and the ExoGemS survey in context with other high-resolution optical spectrographs.",

keywords = "Exoplanets, Exoplanet atmospheric dynamics, Extrasolar gaseous giant planets, Exoplanet atmospheric composition, Hot Jupiters, Transmission spectroscopy, Exoplanet atmospheres",

author = "Deibert, \{Emily K.\} and \{de Mooij\}, \{Ernst J. W.\} and Ray Jayawardhana and Turner, \{Jake D.\} and Andrew Ridden-Harper and Hood, \{Callie E.\} and Fortney, \{Jonathan J.\} and Laura Flagg and Luca Fossati and Romain Allart and Matteo Brogi and MacDonald, \{Ryan J.\}",

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doi = "10.3847/1538-3881/acebdc",

language = "English",

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T1 - ExoGemS high-resolution transmission spectroscopy of WASP-76b with GRACES

AU - Deibert, Emily K.

AU - de Mooij, Ernst J. W.

AU - Jayawardhana, Ray

AU - Turner, Jake D.

AU - Ridden-Harper, Andrew

AU - Hood, Callie E.

AU - Fortney, Jonathan J.

AU - Flagg, Laura

AU - Fossati, Luca

AU - Allart, Romain

AU - Brogi, Matteo

AU - MacDonald, Ryan J.

PY - 2023/10/1

Y1 - 2023/10/1

N2 - We present high-resolution transmission spectroscopy of WASP-76b with Gemini Remote Access to CFHT ESPaDOnS Spectrograph (GRACES)/Gemini North obtained as part of the ExoGemS survey. With a broad spectral range of 400–1050 nm and a relatively high resolution of ∼66,000, these observations are particularly well suited to searching for atomic and molecular atmospheric species via the Doppler cross-correlation technique. We recover absorption features due to neutral iron (Fe i), sodium (Na i), and ionized calcium (Ca ii) at high significance (>5σ), and investigate possible atmospheric temperatures and wind speeds. We also report tentative (>3σ) detections of Li i, K i, Cr i, and V i in the atmosphere of WASP-76b. Finally, we report nondetections of a number of other species, some of which have previously been detected with other instruments. Through model injection/recovery tests, we demonstrate that many of these species are not expected to be detected in our observations. These results allow us to place GRACES and the ExoGemS survey in context with other high-resolution optical spectrographs.

AB - We present high-resolution transmission spectroscopy of WASP-76b with Gemini Remote Access to CFHT ESPaDOnS Spectrograph (GRACES)/Gemini North obtained as part of the ExoGemS survey. With a broad spectral range of 400–1050 nm and a relatively high resolution of ∼66,000, these observations are particularly well suited to searching for atomic and molecular atmospheric species via the Doppler cross-correlation technique. We recover absorption features due to neutral iron (Fe i), sodium (Na i), and ionized calcium (Ca ii) at high significance (>5σ), and investigate possible atmospheric temperatures and wind speeds. We also report tentative (>3σ) detections of Li i, K i, Cr i, and V i in the atmosphere of WASP-76b. Finally, we report nondetections of a number of other species, some of which have previously been detected with other instruments. Through model injection/recovery tests, we demonstrate that many of these species are not expected to be detected in our observations. These results allow us to place GRACES and the ExoGemS survey in context with other high-resolution optical spectrographs.

KW - Exoplanets

KW - Exoplanet atmospheric dynamics

KW - Extrasolar gaseous giant planets

KW - Exoplanet atmospheric composition

KW - Hot Jupiters

KW - Transmission spectroscopy

KW - Exoplanet atmospheres

U2 - 10.3847/1538-3881/acebdc

DO - 10.3847/1538-3881/acebdc

M3 - Article

SN - 0004-6256

VL - 166

JO - Astronomical Journal

JF - Astronomical Journal

IS - 4

M1 - 141

ER -

ExoGemS high-resolution transmission spectroscopy of WASP-76b with GRACES

Abstract

Keywords

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