Artykuł w czasopiśmie
Brak miniatury
Licencja
CC-BYCC-BY - Uznanie autorstwa
 

Kepler K2 Campaign 9 - II. First space-based discovery of an exoplanet using microlensing

Uproszczony widok
dc.abstract.enWe present K2-2016-BLG-0005Lb, a densely sampled, planetary binary caustic-crossing microlensing event found from a blind search of data gathered from Campaign 9 of the Kepler K2 mission (K2C9). K2-2016-BLG-0005Lb is the first bound microlensing exoplanet discovered from space-based data. The event has caustic entry and exit points that are resolved in the K2C9 data, enabling the lens-source relative proper motion to be measured. We have fitted a binary microlens model to the Kepler data and to simultaneous observations from multiple ground-based surveys. Whilst the ground-based data only sparsely sample the binary caustic, they provide a clear detection of parallax that allows us to break completely the microlensing mass-position-velocity degeneracy and measure the planet's mass directly. We find a host mass of 0.58 ± 0.04 M<SUB>⊙</SUB> and a planetary mass of 1.1 ± 0.1 M<SUB>J</SUB>. The system lies at a distance of 5.2 ± 0.2 kpc from Earth towards the Galactic bulge, more than twice the distance of the previous most distant planet found by Kepler. The sky-projected separation of the planet from its host is found to be 4.2 ± 0.3 au which, for circular orbits, deprojects to a host separation $a = 4.4^{+1.9}_{-0.4}$ au and orbital period $P = 13^{+9}_{-2}$ yr. This makes K2-2016-BLG-0005Lb a close Jupiter analogue orbiting a low-mass host star. According to current planet formation models, this system is very close to the host mass threshold below which Jupiters are not expected to form. Upcoming space-based exoplanet microlensing surveys by NASA's Nancy Grace Roman Space Telescope and, possibly, ESA's Euclid mission, will provide demanding tests of current planet formation models.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorSpecht, D.
dc.contributor.authorPoleski, Radosław
dc.contributor.authorPenny, M. T.
dc.contributor.authorKerins, E.
dc.contributor.authorMcDonald, I.
dc.contributor.authorLee, Chung-Uk
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorBond, I. A.
dc.contributor.authorShvartzvald, Y.
dc.contributor.authorZang, Weicheng
dc.contributor.authorStreet, R. A.
dc.contributor.authorHogg, D. W.
dc.contributor.authorGaudi, B. S.
dc.contributor.authorBarclay, T.
dc.contributor.authorBarentsen, G.
dc.contributor.authorHowell, S. B.
dc.contributor.authorMullally, F.
dc.contributor.authorHenderson, C. B.
dc.contributor.authorBryson, S. T.
dc.contributor.authorCaldwell, D. A.
dc.contributor.authorHaas, M. R.
dc.contributor.authorCleve, J. E. Van
dc.contributor.authorLarson, K.
dc.contributor.authorMcCalmont, K.
dc.contributor.authorPeterson, C.
dc.contributor.authorPutnam, D.
dc.contributor.authorRoss, S.
dc.contributor.authorPackard, M.
dc.contributor.authorReedy, L.
dc.contributor.authorAlbrow, Michael D.
dc.contributor.authorChung, Sun-Ju
dc.contributor.authorJung, Youn Kil
dc.contributor.authorGould, Andrew
dc.contributor.authorHan, Cheongho
dc.contributor.authorHwang, Kyu-Ha
dc.contributor.authorRyu, Yoon-Hyun
dc.contributor.authorShin, In-Gu
dc.contributor.authorYang, Hongjing
dc.contributor.authorYee, Jennifer C.
dc.contributor.authorCha, Sang-Mok
dc.contributor.authorKim, Dong-Jin
dc.contributor.authorKim, Seung-Lee
dc.contributor.authorLee, Dong-Joo
dc.contributor.authorLee, Yongseok
dc.contributor.authorPark, Byeong-Gon
dc.contributor.authorPogge, Richard W.
dc.contributor.authorSzymański, Michał
dc.contributor.authorSoszyński, Igor
dc.contributor.authorUlaczyk, K.
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorSkowron, Jan
dc.contributor.authorMróz, Przemysław
dc.contributor.authorMao, Shude
dc.contributor.authorFouqué, Pascal
dc.contributor.authorZhu, Wei
dc.contributor.authorAbe, F.
dc.contributor.authorBarry, R.
dc.contributor.authorBennett, D. P.
dc.contributor.authorBhattacharya, A.
dc.contributor.authorFukui, A.
dc.contributor.authorFujii, H.
dc.contributor.authorHirao, Y.
dc.contributor.authorItow, Y.
dc.contributor.authorKirikawa, R.
dc.contributor.authorKondo, I.
dc.contributor.authorKoshimoto, N.
dc.contributor.authorMatsubara, Y.
dc.contributor.authorMatsumoto, S.
dc.contributor.authorMiyazaki, S.
dc.contributor.authorMuraki, Y.
dc.contributor.authorOlmschenk, G.
dc.contributor.authorRanc, C.
dc.contributor.authorOkamura, A.
dc.contributor.authorRattenbury, N. J.
dc.contributor.authorSatoh, Y.
dc.contributor.authorSumi, T.
dc.contributor.authorSuzuki, D.
dc.contributor.authorSilva, S. I.
dc.contributor.authorToda, T.
dc.contributor.authorTristram, P. J.
dc.contributor.authorVandorou, A.
dc.contributor.authorYama, H.
dc.contributor.authorBeichman, C.
dc.contributor.authorBryden, G.
dc.contributor.authorNovati, S. Calchi
dc.date.accessioned2024-01-25T04:47:02Z
dc.date.available2024-01-25T04:47:02Z
dc.date.copyright2023-01-31
dc.date.issued2023
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number4
dc.description.versionFINAL_PUBLISHED
dc.description.volume520
dc.identifier.doi10.1093/MNRAS/STAD212
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/110313
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2023MNRAS.520.6350S
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages6350-6366
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleKepler K2 Campaign 9 - II. First space-based discovery of an exoplanet using microlensing
dc.typeJournalArticle
dspace.entity.typePublication