Spitzer Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-rotating Low-mass Brown Dwarf

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Shvartzvald, Yossi (author)

Spitzer Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-rotating Low-mass Brown Dwarf

Article/chapterEnglish2019

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2019-02-11
American Astronomical Society,2019
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LIBRIS-ID:oai:DiVA.org:su-166674
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-166674URI
https://doi.org/10.3847/1538-3881/aafe12DOI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

The kinematics of isolated brown dwarfs in the Galaxy, beyond the solar neighborhood, is virtually unknown. Microlensing has the potential to probe this hidden population, as it can measure both the mass and five of the six phase-space coordinates (all except the radial velocity) even of a dark isolated lens. However, the measurements of both the microlens-parallax and finite-source effects are needed in order to recover the full information. Here, we combine the Spitzer satellite parallax measurement with the ground-based light curve, which exhibits strong finite-source effects, of event OGLE-2017-BLG-0896. We find two degenerate solutions for the lens (due to the known satellite-parallax degeneracy), which are consistent with each other except for their proper motion. The lens is an isolated brown dwarf with a mass of either 18 +/- 1 M-J or 20 +/- 1 M-J. This is the lowest isolated-object mass measurement to date, only similar to 45% more massive than the theoretical deuterium-fusion boundary at solar metallicity, which is the common definition of a free-floating planet. The brown dwarf is located at either 3.9 +/- 0.1 kpc or 4.1 +/- 0.1 kpc toward the Galactic bulge, but with proper motion in the opposite direction of disk stars, with one solution suggesting it is moving within the Galactic plane. While it is possibly a halo brown dwarf, it might also represent a different, unknown population.

Subject headings and genre

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
Galaxy: bulge
gravitational lensing: micro

Added entries (persons, corporate bodies, meetings, titles ...)

Yee, Jennifer C. (author)
Skowron, Jan (author)
Lee, Chung-Uk (author)
Udalski, Andrzej (author)
Novati, Sebastiano Calchi (author)
Bozza, Valerio (author)
Beichman, Charles A. (author)
Bryden, Geoffery (author)
Carey, Sean (author)
Gaudi, B. Scott (author)
Henderson, Calen B. (author)
Zhu, Wei (author)
Bachelet, Etienne (author)
Bolt, Greg (author)
Christie, Grant (author)
Maoz, Dan (author)
Natusch, Tim (author)
Pogge, Richard W. (author)
Street, Rachel A. (author)
Tan, Thiam-Guan (author)
Tsapras, Yiannis (author)
Pietrukowicz, Pawel (author)
Soszynski, Igor (author)
Szymanski, Michal K. (author)
Mroz, Przemek (author)
Poleski, Radoslaw (author)
Kozlowski, Szymon (author)
Ulaczyk, Krzysztof (author)
Pawlak, Michal (author)
Rybicki, Krzysztof A. (author)
Iwanek, Patryk (author)
Albrow, Michael D. (author)
Cha, Sang-Mok (author)
Chung, Sun-Ju (author)
Gould, Andrew (author)
Han, Cheongho (author)
Hwang, Kyu-Ha (author)
Jung, Youn Kil (author)
Kim, Dong-Jin (author)
Kim, Hyoun-Woo (author)
Kim, Seung-Lee (author)
Lee, Dong-Joo (author)
Lee, Yongseok (author)
Park, Byeong-Gon (author)
Ryu, Yoon-Hyun (author)
Shin, In-Gu (author)
Zang, Weicheng (author)
Dominik, Martin (author)
Helling, Christiane (author)
Hundertmark, Markus (author)
Jorgensen, Uffe G. (author)
Longa-Pena, Penelope (author)
Lowry, Stephen (author)
Sajadian, Sedighe (author)
Burgdorf, Martin J. (author)
Campbell-White, Justyn (author)
Ciceri, SimonaStockholms universitet,Institutionen för astronomi(Swepub:su)scice (author)
Evans, Daniel F. (author)
Fujii, Yuri (author)
Hinse, Tobias C. (author)
Rahvar, Sohrab (author)
Rabus, Markus (author)
Skottfelt, Jesper (author)
Snodgrass, Colin (author)
Southworth, John (author)
Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

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In:Astronomical Journal: American Astronomical Society157:30004-62561538-3881

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By the author/editor: Shvartzvald, Yos ...; Yee, Jennifer C.; Skowron, Jan; Lee, Chung-Uk; Udalski, Andrzej; Novati, Sebastia ...; show more...; Bozza, Valerio; Beichman, Charle ...; Bryden, Geoffery; Carey, Sean; Gaudi, B. Scott; Henderson, Calen ...; Zhu, Wei; Bachelet, Etienn ...; Bolt, Greg; Christie, Grant; Maoz, Dan; Natusch, Tim; Pogge, Richard W ...; Street, Rachel A ...; Tan, Thiam-Guan; Tsapras, Yiannis; Pietrukowicz, Pa ...; Soszynski, Igor; Szymanski, Micha ...; Mroz, Przemek; Poleski, Radosla ...; Kozlowski, Szymo ...; Ulaczyk, Krzyszt ...; Pawlak, Michal; Rybicki, Krzyszt ...; Iwanek, Patryk; Albrow, Michael ...; Cha, Sang-Mok; Chung, Sun-Ju; Gould, Andrew; Han, Cheongho; Hwang, Kyu-Ha; Jung, Youn Kil; Kim, Dong-Jin; Kim, Hyoun-Woo; Kim, Seung-Lee; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Ryu, Yoon-Hyun; Shin, In-Gu; Zang, Weicheng; Dominik, Martin; Helling, Christi ...; Hundertmark, Mar ...; Jorgensen, Uffe ...; Longa-Pena, Pene ...; Lowry, Stephen; Sajadian, Sedigh ...; Burgdorf, Martin ...; Campbell-White, ...; Ciceri, Simona; Evans, Daniel F.; Fujii, Yuri; Hinse, Tobias C.; Rahvar, Sohrab; Rabus, Markus; Skottfelt, Jespe ...; Snodgrass, Colin; Southworth, John; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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By the university: Stockholm University

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