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ALMA Images the Eccentric HD 53143 Debris Disk

MacGregor, Meredith A. and Hurt, Spencer A. and Stark, Christopher C. and Howard, Ward S. and Weinberger, Alycia J. and Ren, Bin and Schneider, Glenn and Choquet, Élodie and Mawet, Dimitri (2022) ALMA Images the Eccentric HD 53143 Debris Disk. Astrophysical Journal Letters, 933 (1). Art. No. L1. ISSN 2041-8205. doi:10.3847/2041-8213/ac7729.

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We present ALMA 1.3 mm observations of the HD 53143 debris disk—the first infrared or millimeter image produced of this ∼1 Gyr old solar analog. Previous HST STIS coronagraphic imaging did not detect flux along the minor axis of the disk, which could suggest a face-on geometry with two clumps of dust. These ALMA observations reveal a disk with a strikingly different structure. In order to fit models to the millimeter visibilities and constrain the uncertainties on the disk parameters, we adopt a Markov Chain Monte Carlo approach. This is the most eccentric debris disk observed to date with a forced eccentricity of 0.21 ± 0.02, nearly twice that of the Fomalhaut debris disk, and also displays an apocenter glow. Although this eccentric model fits the outer debris disk well, significant interior residuals remain, which may suggest a possible edge-on inner disk, which remains unresolved in these observations. Combined with the observed structure difference between HST and ALMA, these results suggest a potential previous scattering event or dynamical instability in this system. We also note that the stellar flux changes considerably over the course of our observations, suggesting flaring at millimeter wavelengths. Using simultaneous TESS observations, we determine the stellar rotation period to be 9.6 ± 0.1 days.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper observations
MacGregor, Meredith A.0000-0001-7891-8143
Hurt, Spencer A.0000-0002-6903-9080
Howard, Ward S.0000-0002-0583-0949
Weinberger, Alycia J.0000-0001-6654-7859
Ren, Bin0000-0003-1698-9696
Schneider, Glenn0000-0002-4511-5966
Choquet, Élodie0000-0002-9173-0740
Mawet, Dimitri0000-0002-8895-4735
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2022 May 9; revised 2022 June 8; accepted 2022 June 8; published 2022 June 28. This paper makes use of the following ALMA data: ADS/JAO.ALMA #2018.1.00461.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan) and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The TESS data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science Institute. The specific observations analyzed can be accessed via M.A.M. acknowledges support for part of this research from the National Aeronautics and Space Administration (NASA) under award number 19-ICAR19_2-0041. Software: CASA (v5.4.0 McMullin et al. 2007), galario (Tazzari et al. 2018), emcee (Foreman-Mackey et al. 2013), kepler (Foreman-Mackey et al. 2021), Lightkurve (Lightkurve Collaboration et al.2018), astropy (Astropy Collaboration et al. 2013, 2018), astroquery (Ginsburg et al. 2019).
Group:Astronomy Department
Funding AgencyGrant Number
Subject Keywords:Radio astronomy; Submillimeter astronomy; Circumstellar disks; Debris disks; Exoplanet formation; Planet formation; Exoplanet dynamics; Exoplanet evolution; Stellar activity; Stellar flares; Starspots; Stellar physics
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Radio astronomy (1338); Submillimeter astronomy (1647); Circumstellar disks (235); Debris disks (363); Exoplanet formation (492); Planet formation (1241); Exoplanet dynamics (490); Exoplanet evolution (491); Stellar a
Record Number:CaltechAUTHORS:20220722-768731000
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Official Citation:Meredith A. MacGregor et al 2022 ApJL 933 L1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115765
Deposited By: George Porter
Deposited On:26 Jul 2022 21:14
Last Modified:26 Jul 2022 21:14

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