The MESAS Project: ALMA observations of the F-type stars $\gamma$ Lep, $\gamma$ Vir A, and $\gamma$ Vir B

Abstract

The spectrum of stars in the submillimeter to centimeter wavelength range remains poorly constrained due to a lack of data for most spectral types. An accurate characterization of stellar emission in this regime is needed to test stellar atmosphere models, and is also essential for revealing emission associated with unresolved circumstellar debris. We present ALMA observations of the three nearby, main-sequence, debris-poor, F-type stars $\gamma$ Lep, $\gamma$ Vir A, and $\gamma$ Vir B at 0.87 and 1.29 millimeters. We use these data to constrain semi-empirical atmospheric models. We discuss the atmospheric structure of these stars, explore potential short term variability, and the potential impact on debris disk studies. These results are part of an ongoing campaign to obtain long wavelength observations of debris-poor stars, entitled Measuring the Emission of Stellar Atmospheres at Submillimeter/millimeter wavelengths (MESAS).

Accepted to ApJ, 13 pages, 7 figures

References in corpus (6)

• Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
• Debris Disk Evolution Around A Stars
• Observations of solar chromospheric oscillations at 3 mm with ALMA
• The MESAS Project: Long wavelength follow-up observations of Sirius A
• Small-scale structure and dynamics of the lower solar atmosphere
• Non-Linear Convergence of Solar-like Stars Chromospheres using Millimeter, Sub-millimeter, and Infrared Observations

Cited by in corpus (9)

• A detailed characterization of HR 8799's debris disk with ALMA in Band 7
• High resolution ALMA and HST images of q${}^1$ Eri: an asymmetric debris disc with an eccentric Jupiter
• Dust Populations in the Iconic Vega Planetary System Resolved by ALMA
• Resolving Structure in the Debris Disk around HD 206893 with ALMA
• EMISSA -- Exploring Millimeter Indicators of Solar-Stellar Activity I. The Initial mm-cm Main Sequence Star Sample
• A new estimation of astrometric exoplanet detection limits in the habitable zone around nearby stars
• EMISSA -- Exploring Millimetre Indicators of Solar-Stellar Activity II. Towards a robust indicator of stellar activity
• The first radio spectrum of a rapidly rotating A-type star
• Role of non-thermal processes in the quiescent and active millimeter spectrum of a young M dwarf