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Discovery of an Edge-on Circumstellar Debris Disk around BD+45° 598: A Newly Identified Member of the β Pictoris Moving Group

Hinkley, Sasha and Matthews, Elisabeth C. and Lefevre, Charlène and Lestrade, Jean-Francois and Kennedy, Grant and Mawet, Dimitri and Stapelfeldt, Karl R. and Ray, Shrishmoy and Mamajek, Eric and Bowler, Brendan P. and Wilner, David and Williams, Jonathan and Ansdell, Megan and Wyatt, Mark and Lau, Alexis and Phillips, Mark W. and Fernandez, Jorge and Gagné, Jonathan and Bubb, Emma and Sutlieff, Ben J. and Wilson, Thomas J. G. and Matthews, Brenda and Ngo, Henry and Piskorz, Danielle and Crepp, Justin R. and Gonzalez, Erica and Mann, Andrew W. and Mace, Gregory (2021) Discovery of an Edge-on Circumstellar Debris Disk around BD+45° 598: A Newly Identified Member of the β Pictoris Moving Group. Astrophysical Journal, 912 (2). Art. No. 115. ISSN 0004-637X. doi:10.3847/1538-4357/abec6e.

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We report the discovery of a circumstellar debris disk viewed nearly edge-on and associated with the young, K1 star BD+45° 598 using high-contrast imaging at 2.2 μm obtained at the W.M. Keck Observatory. We detect the disk in scattered light with a peak significance of ~5σ over three epochs, and our best-fit model of the disk is an almost edge-on ~70 au ring, with inclination angle ~87°. Using the NOEMA interferometer at the Plateau de Bure Observatory operating at 1.3 mm, we find resolved continuum emission aligned with the ring structure seen in the 2.2 μm images. We estimate a fractional infrared luminosity of L_(IR)/L_(tot) ≃6⁺²₋₁ × 10⁻⁴, higher than that of the debris disk around AU Mic. Several characteristics of BD+45° 598, such as its galactic space motion, placement in a color–magnitude diagram, and strong presence of lithium, are all consistent with its membership in the β Pictoris Moving Group with an age of 23 ± 3 Myr. However, the galactic position for BD+45° 598 is slightly discrepant from previously known members of the β Pictoris Moving Group, possibly indicating an extension of members of this moving group to distances of at least 70 pc. BD+45° 598 appears to be an example from a population of young circumstellar debris systems associated with newly identified members of young moving groups that can be imaged in scattered light, key objects for mapping out the early evolution of planetary systems from ~10–100 Myr. This target will also be ideal for northern-hemisphere, high-contrast imaging platforms to search for self-luminous, planetary mass companions residing in this system.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Hinkley, Sasha0000-0001-8074-2562
Matthews, Elisabeth C.0000-0003-0593-1560
Lefevre, Charlène0000-0001-7349-6113
Kennedy, Grant0000-0001-6831-7547
Mawet, Dimitri0000-0002-8895-4735
Stapelfeldt, Karl R.0000-0002-2805-7338
Mamajek, Eric0000-0003-2008-1488
Bowler, Brendan P.0000-0003-2649-2288
Wilner, David0000-0003-1526-7587
Williams, Jonathan0000-0001-5058-695X
Ansdell, Megan0000-0003-4142-9842
Wyatt, Mark0000-0001-9064-5598
Lau, Alexis0000-0003-3802-828X
Phillips, Mark W.0000-0001-6041-7092
Gagné, Jonathan0000-0002-2592-9612
Sutlieff, Ben J.0000-0002-9962-132X
Matthews, Brenda0000-0003-3017-9577
Ngo, Henry0000-0001-5172-4859
Piskorz, Danielle0000-0003-4451-2342
Crepp, Justin R.0000-0003-0800-0593
Mann, Andrew W.0000-0003-3654-1602
Mace, Gregory0000-0001-7875-6391
Additional Information:© 2021. The American Astronomical Society. Received 2020 December 9; revised 2021 March 2; accepted 2021 March 4; published 2021 May 11. We thank the anonymous referee for several helpful comments, which improved the quality of the manuscript. Some of this work was performed in part under an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1203023. Some of the data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and NASA. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. Part of this work has been carried out within the framework of the National Centre of Competence in Research PlanetS supported by the Swiss National Science Foundation. E.C.M. acknowledges the financial support of the SNSF. G.M.K. is supported by the Royal Society as a Royal Society University Research Fellow. The Submillimeter Array is a joint project between the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics and is funded by the Smithsonian Institution and the Academia Sinica. This work used the Immersion Grating Infrared Spectrometer (IGRINS) that was developed under a collaboration between the University of Texas at Austin and the Korea Astronomy and Space Science Institute (KASI) with the financial support of the Mt. Cuba Astronomical Foundation, of the US National Science Foundation under grants AST-1229522 and AST-1702267, of the McDonald Observatory of the University of Texas at Austin, of the Korean GMT Project of KASI, and Gemini Observatory. This paper includes data taken at The McDonald Observatory of The University of Texas at Austin. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004).
Group:Astronomy Department
Funding AgencyGrant Number
NSF Astronomy and Astrophysics FellowshipAST-1203023
W. M. Keck FoundationUNSPECIFIED
Swiss National Science Foundation (SNSF)UNSPECIFIED
Smithsonian InstitutionUNSPECIFIED
Academia SinicaUNSPECIFIED
Mt. Cuba Astronomical FoundationUNSPECIFIED
Subject Keywords:Circumstellar disks
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Circumstellar disks (235)
Record Number:CaltechAUTHORS:20210517-085457959
Persistent URL:
Official Citation:Sasha Hinkley et al 2021 ApJ 912 115
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109142
Deposited By: Tony Diaz
Deposited On:17 May 2021 18:18
Last Modified:17 May 2021 18:18

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