Article

Abstract

• We present high-resolution observations of a flaring event in the M8 dwarf vB 10 using the near-infrared Habitable-zone Planet Finder (HPF) spectrograph on the Hobby-Eberly Telescope. The high stability of HPF enables us to accurately subtract a vB 10 quiescent spectrum from the flare spectrum to isolate the flare contributions and study the changes in the relative energy of the Ca II infrared triplet, several Paschen lines, the He λ10830 triplet lines, and to select iron and magnesium lines in HPFʼs bandpass. Our analysis reveals the presence of a red asymmetry in the He λ10830 triplet, which is similar to signatures of coronal rain in the Sun. Photometry of the flare derived from an acquisition camera before spectroscopic observations and the ability to extract spectra from up-the-ramp observations with the HPF infrared detector enable us to perform time-series analysis of part of the flare and provide coarse constraints on the energy and frequency of such flares. We compare this flare with historical observations of flares around vB 10 and other ultracool M dwarfs and attempt to place limits on flare- induced atmospheric mass loss for hypothetical planets around vB 10.

Creator

• Kowalski, Adam F
• Fredrick, Connor
• Diddams, Scott A.

Date Issued

• 2022

Academic Affiliation

• College of Engineering and Applied Science

Journal Title

• The Astrophysical Journal: an international review of astronomy and astronomical physics Journal

Journal Issue/Number

• 2

Journal Volume

• 925

Last Modified

• 2024-11-09

Resource Type

• Article

Rights Statement

• In Copyright

DOI

•  https://doi.org/10.3847/1538-4357/ac3e61

ISSN

• 0004-637X

Language

• English [eng]

License

• Creative Commons BY Attribution 4.0 International

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