ALMA and VLA Observations of EX Lupi in its Quiescent State

J. A. White, Á. Kóspál, A. G. Hughes, P. Ábrahám, V. Akimkin, A. Banzatti, L. Chen, F. Cruz-Sáenz de Miera, A. Dutrey, M. Flock, S. Guilloteau, A. S. Hales, T. Henning, K. Kadam, D. Semenov, A. Sicilia-Aguilar, R. Teague, E. I. Vorobyov

Research output: Contribution to journalArticlepeer-review

Abstract

Extreme outbursts in young stars may be a common stage of pre-main-sequence stellar evolution. These outbursts, caused by enhanced accretion and accompanied by increased luminosity, can also strongly impact the evolution of the circumstellar environment. We present Atacama Large Millimeter Array (ALMA) and Very Large Array observations of EX Lupi, a prototypical outburst system, at 100, 45, and 15 GHz. We use these data, along with archival ALMA 232 GHz data, to fit radiative transfer models to EX Lupi's circumstellar disk in its quiescent state following the extreme outburst in 2008. The best-fit models show a compact disk with a characteristic dust radius of 45 au and a total mass of 0.01 Me. Our modeling suggests grain growth to sizes of at least 3 mm in the disk, possibly spurred by the recent outburst, and an ice line that has migrated inward to 0.2-0.3 au post-outburst. At 15 GHz, we detected significant emission over the expected thermal disk emission which we attribute primarily to stellar (gyro)synchrotron and free-free disk emission. Altogether, these results highlight what may be a common impact of outbursts on the circumstellar dust.

Original languageEnglish
Article number37
Number of pages15
JournalAstrophysical Journal
Volume904
Issue number1
Early online date1 Oct 2020
DOIs
Publication statusPublished - 20 Nov 2020

Keywords

  • FU Orionis stars (553)
  • Millimeter astronomy (1061)
  • Pre-main sequence stars (1290)
  • Protoplanetary (1300)
  • Radio continuum emission (1340)
  • Radio interferometry (1346)
  • Stellar accretion disks (1579)

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