Deep ALMA search for CO gas in the HD 95086 debris disc

Mark Booth, Luca Matrà, Kate Y.L. Su, Quentin Kral, Antonio S. Hales, William R.F. Dent, A. Meredith Hughes, Meredith A. MacGregor, Torsten Löhne, David J. Wilner

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

One of the defining properties of debris discs compared to protoplanetary discs used to be their lack of gas, yet small amounts of gas have been found around an increasing number of debris discs in recent years. These debris discs found to have gas tend to be both young and bright. In this paper, we conduct a deep search for CO gas in the system HD 95086 – a 17 Myr old, known planet host that also has a debris disc with a high fractional luminosity of 1.5 × 10−3. Using the Atacama Large Millimeter/submillimeter Array (ALMA), we search for CO emission lines in bands 3, 6, and 7. By implementing a spectro-spatial filtering technique, we find tentative evidence for CO J = 2–1 emission in the disc located at a velocity, 8.5 ± 0.2 km s−1, consistent with the radial velocity of the star. The tentative detection suggests that the gas on the east side of the disc is moving towards us. In the same region where continuum emission is detected, we find an integrated line flux of 9.5 ± 3.6 mJy km s−1, corresponding to a CO mass of (1.4–13) × 10−6 M. Our analysis confirms that the level of gas present in the disc is inconsistent with the presence of primordial gas in the system and is consistent with second generation production through the collisional cascade.

Original languageEnglish (US)
Pages (from-to)3443-3452
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume482
Issue number3
DOIs
StatePublished - Jan 21 2019

Keywords

  • Circumstellar matter
  • Planetary systems
  • Stars: individual: HD 95086
  • Submillimetre: planetary systems
  • Submillimetre: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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