Ultracool dwarfs candidates based on 6 yr of the Dark Energy Survey data

Author:

dal Ponte M12ORCID,Santiago B12,Carnero Rosell A234ORCID,De Paris L1,Pace A B5ORCID,Bechtol K6,Abbott T M C7,Aguena M2,Allam S8,Alves O9,Bacon D10,Bertin E1112,Bocquet S13,Brooks D14,Burke D L1516,Kind M Carrasco1718,Carretero J19,Conselice C2021,Costanzi M222324,Desai S25,De Vicente J26,Doel P14,Everett S27,Ferrero I28,Flaugher B8,Frieman J829,García-Bellido J30,Gerdes D W319,Gruendl R A1718,Gruen D13,Gutierrez G8,Hinton S R32,Hollowood D L33,James D J34,Kuehn K3536,Kuropatkin N8,Marshall J L3738,Mena-Fernández J26,Menanteau F1718,Miquel R1938,Ogando R L C39,Palmese A40,Paz-Chinchón F1741,Pereira M E S42,Plazas Malagón A A43,Pieres A239ORCID,Raveri M44,Rodriguez-Monroy M26,Sanchez E26,Scarpine V8,Schubnell M9,Sevilla-Noarbe I26,Smith M45,Soares-Santos M9,Suchyta E46,Swanson M E C19,Tarle G9,Thomas D10,To C47,Weaverdyck N948,

Affiliation:

1. Instituto de Física , UFRGS, Caixa Postal 15051, Porto Alegre RS-91501-970, Brazil

2. Laboratório Interinstitucional de e-Astronomia - LIneA , Rua Gal. José Cristino 77, Rio de Janeiro RJ-20921-400, Brazil

3. Instituto de Astrofisica de Canarias , E-38205 La Laguna, Tenerife, Spain

4. Universidad de La Laguna , Dpto. Astrofísica, E-38206 La Laguna, Tenerife, Spain

5. McWilliams Center for Cosmology, Carnegie Mellon University , 5000 Forbes Ave, Pittsburgh, PA 15213, USA

6. Physics Department, University of Wisconsin-Madison , Madison, WI 53706, USA

7. Cerro Tololo Inter-American Observatory, NSF’s National Optical-Infrared Astronomy Research Laboratory , Casilla 603, La Serena, Chile

8. Fermi National Accelerator Laboratory , PO Box 500, Batavia, IL 60510, USA

9. Department of Physics, University of Michigan , Ann Arbor, MI 48109, USA

10. Institute of Cosmology and Gravitation, University of Portsmouth , Portsmouth, PO1 3FX, UK

11. CNRS , UMR 7095, Institut d’Astrophysique de Paris, F-75014 Paris, France

12. Sorbonne Universités , UPMC Univ Paris 06, UMR 7095, Institut d’Astrophysique de Paris, F-75014 Paris, France

13. University Observatory, Faculty of Physics , Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich, Germany

14. Department of Physics & Astronomy, University College London , Gower Street, London, WC1E 6BT, UK

15. Kavli Institute for Particle Astrophysics & Cosmology , PO Box 2450, Stanford University, Stanford, CA 94305, USA

16. SLAC National Accelerator Laboratory , Menlo Park, CA 94025, USA

17. Center for Astrophysical Surveys, National Center for Supercomputing Applications , 1205 West Clark St., Urbana, IL 61801, USA

18. Department of Astronomy, University of Illinois at Urbana-Champaign , 1002 W. Green Street, Urbana, IL 61801, USA

19. Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology , Campus UAB, E-08193 Bellaterra (Barcelona) Spain

20. Jodrell Bank Center for Astrophysics, School of Physics and Astronomy, University of Manchester , Oxford Road, Manchester, M13 9PL, UK

21. University of Nottingham, School of Physics and Astronomy , Nottingham NG7 2RD, UK

22. Astronomy Unit, Department of Physics, University of Trieste , via Tiepolo 11, I-34131 Trieste, Italy

23. INAF-Osservatorio Astronomico di Trieste , via G. B. Tiepolo 11, I-34143 Trieste, Italy

24. Institute for Fundamental Physics of the Universe , Via Beirut 2, 34014 Trieste, Italy

25. Department of Physics , IIT Hyderabad, Kandi, Telangana 502285, India

26. Centro de Investigaciones Energéticas , Medioambientales y Tecnológicas (CIEMAT), E-28040 Madrid, Spain

27. Jet Propulsion Laboratory, California Institute of Technology , 4800 Oak Grove Dr, Pasadena, CA 91109, USA

28. Institute of Theoretical Astrophysics, University of Oslo . PO Box 1029 Blindern, NO-0315 Oslo, Norway

29. Kavli Institute for Cosmological Physics, University of Chicago , Chicago, IL 60637, USA

30. Instituto de Fisica Teorica UAM/CSIC , Universidad Autonoma de Madrid, E-28049 Madrid, Spain

31. Department of Astronomy, University of Michigan , Ann Arbor, MI 48109, USA

32. School of Mathematics and Physics, University of Queensland , Brisbane, QLD 4072, Australia

33. Santa Cruz Institute for Particle Physics , Santa Cruz, CA 95064, USA

34. Center for Astrophysics | Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA

35. Australian Astronomical Optics, Macquarie University , North Ryde, NSW 2113, Australia

36. Lowell Observatory , 1400 Mars Hill Rd, Flagstaff, AZ 86001, USA

37. George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A&M University , College Station, TX 77843, USA

38. Institució Catalana de Recerca i Estudis Avançats , E-08010 Barcelona, Spain

39. Observatório Nacional , Rua Gal. José Cristino 77, Rio de Janeiro, RJ-20921-400, Brazil

40. Department of Astronomy, University of California , Berkeley, 501 Campbell Hall, Berkeley, CA 94720, USA

41. Institute of Astronomy, University of Cambridge , Madingley Road, Cambridge CB3 0HA, UK

42. Hamburger Sternwarte , Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany

43. Department of Astrophysical Sciences, Princeton University , Peyton Hall, Princeton, NJ 08544, USA

44. Department of Physics and Astronomy, University of Pennsylvania , Philadelphia, PA 19104, USA

45. School of Physics and Astronomy, University of Southampton , Southampton, SO17 1BJ, UK

46. Computer Science and Mathematics Division, Oak Ridge National Laboratory , Oak Ridge, TN 37831, USA

47. Center for Cosmology and Astro-Particle Physics, The Ohio State University , Columbus, OH 43210, USA

48. Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA

Abstract

ABSTRACT We present a sample of 19 583 ultracool dwarf candidates brighter than z ≤23 selected from the Dark Energy Survey DR2 coadd data matched to VHS DR6, VIKING DR5, and AllWISE covering ∼ 480 deg2. The ultracool candidates were first pre-selected based on their (i–z), (z–Y), and (Y–J) colours. They were further classified using a method that compares their optical, near-infrared, and mid-infrared colours against templates of M, L, and T dwarfs. 14 099 objects are presented as new L and T candidates and the remaining objects are from the literature, including 5342 candidates from our previous work. Using this new and deeper sample of ultracool dwarf candidates we also present: 20 new candidate members to nearby young moving groups and associations, variable candidate sources and four new wide binary systems composed of two ultracool dwarfs. Finally, we also show the spectra of 12 new ultracool dwarfs discovered by our group and presented here for the first time. These spectroscopically confirmed objects are a sanity check of our selection of ultracool dwarfs and photometric classification method.

Funder

U.S. Department of Energy

National Science Foundation

Science and Technology Facilities Council

University of Illinois

University of Chicago

Ohio State University

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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