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Published October 2019 | Version Submitted + Published
Journal Article Open

KMT-2018-BLG-1990Lb: A Nearby Jovian Planet From A Low-cadence Microlensing Field

Creators

  • 1. ROR icon Korea Astronomy and Space Science Institute
  • 2. ROR icon Max Planck Institute for Astronomy
  • 3. ROR icon The Ohio State University
  • 4. ROR icon University of Canterbury
  • 5. ROR icon Korea University of Science and Technology
  • 6. ROR icon Chungbuk National University
  • 7. ROR icon Harvard-Smithsonian Center for Astrophysics
  • 8. ROR icon Infrared Processing and Analysis Center
  • 9. ROR icon Tsinghua University
  • 10. ROR icon Kyung Hee University

Abstract

We report the discovery of KMT-2018-BLG-1990Lb, a Jovian planet (m_p = 0.57^(+0.79)_(-0.25) M_J) orbiting a late M dwarf (M = 0.14^(+0.20)_(-0.06) M⊙) at a distance of (D_L = 1.23^(+1.06)_(-0.43) kpc, and projected at 2.6 ± 0.6 times the snow line distance, i.e., a_(snow) ≡ 2.7 au (M/M⊙). This is the second Jovian planet discovered by the Korea Microlensing Telescope Network (KMTNet) in its low-cadence (0.4 hr^(−1)) fields, demonstrating that this population can be probed based on relatively low-cadence survey-only microlensing data. However, while many Jovian-planet microlensing events will not have caustic crossings (e.g., the previous case, KMT-2016-BLG-1397) and some that do will be well characterized by low-cadence survey observations (e.g., the current case), in general higher-cadence follow-up observations of the caustic crossings are preferable. Such follow-up observations require microlensing alerts, which KMTNet now provides.

Additional Information

© 2019 The American Astronomical Society. Received 2019 February 21; revised 2019 August 7; accepted 2019 August 8; published 2019 September 20. We thank the anonymous referee for an exceptionally helpful report. Work by A.G. was supported by AST-1516842 from the US NSF. I.G.S. and A.G. were supported by JPL grant 1500811. A.G. received support from the European Research Council under the European Unions Seventh Framework Programme (FP 7) ERC Grant Agreement No. [321035]. Work by C.H. was supported by the grant (2017R1A4A1015178) of National Research Foundation of Korea. This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI) and the data were obtained at three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia.

Attached Files

Published - Ryu_2019_AJ_158_151.pdf

Submitted - 1905.05509.pdf

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1905.05509.pdf

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Additional details

Identifiers

Eprint ID
98779
Resolver ID
CaltechAUTHORS:20190920-135255305

Related works

Describes
https://arxiv.org/abs/1905.05509 (URL)

Funding

NSF
AST-1516842
JPL
1500811
European Research Council (ERC)
321035
National Research Foundation of Korea
2017R1A4A1015178

Dates

Created
2019-09-20
Created from EPrint's datestamp field
Updated
2021-11-16
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Infrared Processing and Analysis Center (IPAC)