TY - JOUR
T1 - Deep ALMA search for CO gas in the HD 95086 debris disc
AU - Booth, Mark
AU - Matrà, Luca
AU - Su, Kate Y.L.
AU - Kral, Quentin
AU - Hales, Antonio S.
AU - Dent, William R.F.
AU - Hughes, A. Meredith
AU - MacGregor, Meredith A.
AU - Löhne, Torsten
AU - Wilner, David J.
N1 - Funding Information:
The authors thank Steve Ertel, Sarah Morrison, and Renu Malhotra for providing comments on a draft of the manuscript and also thank the referee for a thorough and constructive review. MB acknowledges support from the Deutsche Forschungsgemeinschaft through project Kr 2164/15-1. LM acknowledges support from the Smith-sonian Institution as a Submillimeter Array (SMA) Fellow. QK acknowledges support from STFC via the Institute of Astronomy, Cambridge Consolidated Grant. AMH acknowledges support from National Science Foundation (NSF) grant AST-1412647. MAM acknowledges support from an NSF Astronomy and Astrophysics Postdoctoral Fellowship under Award no. AST-1701406. TL acknowledges support from the Deutsche Forschungsgemeinschaft through project Lo 1715/2-1. This paper makes use of the following ALMA data:
Publisher Copyright:
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
PY - 2019/1/21
Y1 - 2019/1/21
N2 - 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.
AB - 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.
KW - Circumstellar matter
KW - Planetary systems
KW - Stars: individual: HD 95086
KW - Submillimetre: planetary systems
KW - Submillimetre: stars
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U2 - 10.1093/mnras/sty2993
DO - 10.1093/mnras/sty2993
M3 - Article
AN - SCOPUS:85063530141
SN - 0035-8711
VL - 482
SP - 3443
EP - 3452
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -