Results 21 to 30 of about 480 (252)

Planet–planet scattering alone cannot explain the free-floating planet population [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2012
ABSTRACT Recent gravitational microlensing observations predict a vast population of free-floating giant planets that outnumbers main-sequence stars almost twofold. A frequently invoked mechanism for generating this population is a dynamical instability that incites planet–planet scattering and the ejection of one or more planets in ...
Veras, Dimitri, Raymond, Sean N.
openaire   +3 more sources

The Demographics of Rocky Free-floating Planets and their Detectability by WFIRST [PDF]

The Astrophysical Journal, 2017
Abstract Planets are thought to form via accretion from a remnant disk of gas and solids around a newly formed star. During this process, material in the disk either remains bound to the star as part of either a planet, a smaller celestial body, or makes up part of the the interplanetary medium; falls into the star; or is ejected from ...
Barclay, Thomas, Quintana, Elisa V., Raymond, Sean N., Penny, Matthew T.   +3 more
openaire   +2 more sources

Microlensing planets in M 22: Free-floating or bound? [PDF]

Astronomy & Astrophysics, 2001
We use detailed numerical simulations and theoretical estimates to show that, if confirmed, the unusually brief microlensing events observed by Sahu et al. (2001) in the field of the globular cluster M22 might be explained as a result of microlensing by a population of clustered MACHOs, a dark cluster or RAMBO, not associated with the globular cluster.
Marcos, R. de la Fuente, Marcos, C. de la Fuente   +1 more
openaire   +2 more sources

Free-floating planets in the Milky Way [PDF]

Arabian Journal of Mathematics, 2019
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Hamolli L., Hafizi M., de Paolis F., Nucita A. A.   +3 more
openaire   +2 more sources

Terrestrial- and Neptune-mass Free-Floating Planet Candidates from the MOA-II 9 yr Galactic Bulge Survey

The Astronomical Journal, 2023
We report the discoveries of low-mass free-floating planet (FFP) candidates from the analysis of 2006–2014 MOA-II Galactic bulge survey data. In this data set, we found 6111 microlensing candidates and identified a statistical sample consisting of 3535 ...
Naoki Koshimoto, Takahiro Sumi, David P. Bennett, Valerio Bozza, Przemek Mróz, Andrzej Udalski, Nicholas J. Rattenbury, Fumio Abe, Richard Barry, Aparna Bhattacharya, Ian A. Bond, Hirosane Fujii, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Greg Olmschenk, Clément Ranc, Yuki Satoh, Daisuke Suzuki, Mio Tomoyoshi, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita, MOA Collaboration   +31 more
doaj   +1 more source

Capture of free-floating planets by stellar systems [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
Evidence of exoplanets with orbits that are misaligned with the spin of the host star may suggest that not all bound planets were born in the protoplanetary disk of their current planetary system. Observations have shown that free-floating Jupiter-mass objects can exceed the number of stars in our galaxy, implying that capture scenarios may not be so ...
Goulinski, Nadav, Ribak, Erez N.
openaire   +3 more sources

Free-floating planets from core accretion theory: microlensing predictions [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2016
Abstract We calculate the microlensing event rate and typical time-scales for the free-floating planet (FFP) population that is predicted by the core accretion theory of planet formation. The event rate is found to be ∼1.8 × 10−3 of that for the stellar population. While the stellar microlensing event time-scale peaks at around 20 d, the
Ma, Sizheng, Mao, Shude, Ida, Shigeru, Zhu, Wei, Lin, Douglas N C   +4 more
openaire   +3 more sources

A Review on Substellar Objects below the Deuterium Burning Mass Limit: Planets, Brown Dwarfs or What?

Geosciences, 2018
“Free-floating, non-deuterium-burning, substellar objects” are isolated bodies of a few Jupiter masses found in very young open clusters and associations, nearby young moving groups, and in the immediate vicinity of the Sun.
José A. Caballero
doaj   +1 more source

KMT-2017-BLG-2820 and the Nature of the Free-floating Planet Population [PDF]

The Astronomical Journal, 2021
Abstract We report a new free-floating planet (FFP) candidate, KMT-2017-BLG-2820, with Einstein radius θ E ≃ 6 μas, lens-source relative proper motion μ rel ≃ 8 mas yr−1, and Einstein timescale t E = 6.5 hr.
Ryu, Yoon-Hyun, Mróz, Przemek, Gould, Andrew, Hwang, Kyu-Ha, Kim, Hyoun-Woo, Yee, Jennifer C., Albrow, Michael D., Chung, Sun-Ju, Jung, Youn Kil, Shin, In-Gu, Shvartzvald, Yossi, Zang, Weicheng, Cha, Sang-Mok, Kim, Dong-Jin, Kim, Seung-Lee, Lee, Chung-Uk, Lee, Dong-Joo, Lee, Yongseok, Park, Byeong-Gon, Han, Cheongho, Pogge, Richard W., Udalski, Andrzej, Poleski, Radek, Skowron, Jan, Szymański, Michał K., Soszyński, Igor, Pietrukowicz, Paweł, Kozłowski, Szymon, Ulaczyk, Krzysztof, Rybicki, Krzysztof A., Iwanek, Patryk, KMTNet Collaboration, OGLE Collaboration   +32 more
openaire   +4 more sources

Free-floating Planet Mass Function from MOA-II 9 yr Survey toward the Galactic Bulge

The Astronomical Journal, 2023
We present the first measurement of the mass function of free-floating planets (FFPs), or very wide orbit planets down to an Earth mass, from the MOA-II microlensing survey in 2006–2014.
Takahiro Sumi, Naoki Koshimoto, David P. Bennett, Nicholas J. Rattenbury, Fumio Abe, Richard Barry, Aparna Bhattacharya, Ian A. Bond, Hirosane Fujii, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Greg Olmschenk, Clément Ranc, Yuki Satoh, Daisuke Suzuki, Mio Tomoyoshi, Paul . J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita, MOA Collaboration   +28 more
doaj   +1 more source