High-resolution Near-infrared Spectroscopy of a Flare around the Ultracool Dwarf vB 10

Shubham Kanodia, Lawrence W. Ramsey, Marissa Maney, Suvrath Mahadevan, Caleb I. Cañas, Joe P. Ninan, Andrew Monson, Adam F. Kowalski, Maximos C. Goumas, Gudmundur Stefansson, Chad F. Bender, William D. Cochran, Scott A. Diddams, Connor Fredrick, Samuel Halverson, Fred Hearty, Steven Janowiecki, Andrew J. Metcalf, Stephen C. Odewahn, Paul RobertsonArpita Roy, Christian Schwab, Ryan C. Terrien

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

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 HPF's 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.

Original languageEnglish (US)
Article number155
JournalAstrophysical Journal
Volume925
Issue number2
DOIs
StatePublished - Feb 1 2022

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint

Dive into the research topics of 'High-resolution Near-infrared Spectroscopy of a Flare around the Ultracool Dwarf vB 10'. Together they form a unique fingerprint.

Cite this