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SPORK That Spectrum: increasing detection significances from high-resolution exoplanet spectroscopy with novel smoothing algorithms

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Rasmussen, Kaitlin C., Brogi, Matteo, Rahman, Fahin, Beltz, Hayley, Currie, Miles, Rauscher, Emily and Ji, Alexander P. (2022) SPORK That Spectrum: increasing detection significances from high-resolution exoplanet spectroscopy with novel smoothing algorithms. The Astronomical Journal, 164 (2). p. 35. doi:10.3847/1538-3881/ac6bfa ISSN 1538-3881.

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Official URL: https://doi.org/10.3847/1538-3881/ac6bfa

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Abstract

Spectroscopic studies of planets outside of our own solar system provide some of the most crucial information about their formation, evolution, and atmospheric properties. In ground-based spectroscopy, the process of extracting the planets signal from the stellar and telluric signal has proven to be the most difficult barrier to accurate atmospheric information. However, with novel normalization and smoothing methods, this barrier can be minimized and the detection significance dramatically increased over existing methods. In this paper, we take two examples of CRIRES emission spectroscopy taken of HD 209458 b and HD 179949 b, and apply SPORK (SPectral cOntinuum Refinement for telluriKs) and iterative smoothing to boost the detection significance from 5.78 to 9.71σ, and from 4.38σ to 6.89σ, respectively. These methods, which largely address systematic quirks introduced by imperfect detectors or reduction pipelines, can be employed in a wide variety of scenarios, from archival data sets to simulations of future spectrographs.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Extrasolar planets -- Atmospheres, Astrophysics, Extrasolar planets -- Detection, High resolution spectroscopy
Journal or Publication Title: The Astronomical Journal
Publisher: The American Astronomical Society
ISSN: 1538-3881
Official Date: 5 July 2022
Dates:
DateEvent
5 July 2022Published
13 April 2022Accepted
Volume: 164
Number: 2
Page Range: p. 35
DOI: 10.3847/1538-3881/ac6bfa
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 2 August 2022
Date of first compliant Open Access: 2 August 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
2019-1403Heising-Simons Foundationhttp://dx.doi.org/10.13039/100014155
Related URLs:
  • http://creativecommons.org/licenses/by/4...

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