☆ 4.1 Article

XO-2b: a Prograde Planet with Negligible Eccentricity and an Additional Radial Velocity Variation

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN (2011)

Journal

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN

Volume 63, Issue 6, Pages L67-L71

Publisher

OXFORD UNIV PRESS

DOI: 10.1093/pasj/63.6.L67

Keywords

stars: binaries: general; stars: planetary systems: individual (XO-2); stars: rotation; techniques: radial velocities; techniques: spectroscopic

Categories

Astronomy & Astrophysics

Funding

NINS
Japan Society for Promotion of Science (JSPS) [DC1: 22-5935]
Ministry of Education, Culture, Sports, Science and Technology [22000005]

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Abstract

We present precise radial velocities of XO-2 taken with the Subaru HDS, covering two transits of XO-2b with an interval of nearly two years. The data suggest that the orbital eccentricity of XO-2b is consistent with zero within 2 sigma (e = 0.045 +/- 0.024), and that the orbit of XO-2b is prograde (the sky-projected spin orbit alignment angle lambda = 10 degrees +/- 72 degrees). The poor constraint of lambda is due to a small impact parameter (the orbital inclination of XO-2b is almost 90 degrees). The data also provide an improved estimate of the mass of XO-2b as 0.62 +/- 0.02 M-Jup. Further, we find a long-term radial velocity variation in this system. Additional radial velocity measurements are necessary to specify the cause of this additional variation.

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Article Astronomy & Astrophysics

Another shipment of six short-period giant planets from TESS

Joseph E. Rodriguez, Samuel N. Quinn, Andrew Vanderburg, George Zhou, Jason D. Eastman, Erica Thygesen, Bryson Cale, David R. Ciardi, Phillip A. Reed, Ryan J. Oelkers, Karen A. Collins, Allyson Bieryla, David W. Latham, Erica J. Gonzales, B. Scott Gaudi, Coel Hellier, Matias I. Jones, Rafael Brahm, Kirill Sokolovsky, Jack Schulte, Gregor Srdoc, John Kielkopf, Ferran Grau Horta, Bob Massey, Phil Evans, Denise C. Stephens, Kim K. McLeod, Nikita Chazov, Vadim Krushinsky, Mourad Ghachoui, Boris S. Safonov, Cayla M. Dedrick, Dennis Conti, Didier Laloum, Steven Giacalone, Carl Ziegler, Pere Guerra Serra, Ramon Naves Nogues, Felipe Murgas, Edward J. Michaels, George R. Ricker, Roland K. Vanderspek, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Brett Addison, Owen Alfaro, D. R. Anderson, Elias Aydi, Thomas G. Beatty, Timothy R. Bedding, Alexander A. Belinski, Zouhair Benkhaldoun, Perry Berlind, Cullen H. Blake, Michael J. Bowen, Brendan P. Bowler, Andrew W. Boyle, Dalton Branson, Cesar Briceno, Michael L. Calkins, Emma Campbell, Jessie L. Christiansen, Laura Chomiuk, Kevin I. Collins, Matthew A. Cornachione, Ahmed Daassou, Courtney D. Dressing, Gilbert A. Esquerdo, Dax L. Feliz, William Fong, Akihiko Fukui, Tianjun Gan, Holden Gill, Maria V. Goliguzova, Jarrod Hansen, Thomas Henning, Eric G. Hintz, Melissa J. Hobson, Jonathan Horner, Chelsea X. Huang, David J. James, Jacob S. Jensen, Samson A. Johnson, Andres Jordan, Stephen R. Kane, Khalid Barkaoui, Myung-Jin Kim, Kingsley Kim, Rudolf B. Kuhn, Nicholas Law, Pablo Lewin, Hui-Gen Liu, Michael B. Lund, Andrew W. Mann, Nate McCrady, Matthew W. Mengel, Jessica Mink, Lauren G. Murphy, Norio Narita, Patrick Newman, Jack Okumura, Hugh P. Osborn, Martin Paegert, Enric Palle, Joshua Pepper, Peter Plavchan, Alexander A. Popov, Markus Rabus, Jessica Ranshaw, Jennifer A. Rodriguez, Dong-Goo Roh, Michael A. Reefe, Arjun B. Savel, Richard P. Schwarz, Avi Shporer, Robert J. Siverd, David H. Sliski, Keivan G. Stassun, Daniel J. Stevens, Abderahmane Soubkiou, Eric B. Ting, C. G. Tinney, Noah Vowell, Payton Walton, R. G. West, Maurice L. Wilson, Robert A. Wittenmyer, Justin M. Wittrock, Shania Wolf, Jason T. Wright, Hui Zhang, Evan Zobel

Summary: We have discovered and characterized six short-period, transiting giant planets from NASA's TESS. These planets orbit bright host stars, are Jovian-sized, have masses ranging from 0.92 to 5.26 M-J, and orbit F, G, and K stars. The three longest-period systems in our sample show significant orbital eccentricity. Despite orbiting subgiant host stars, two of these planets show no sign of inflation, which may be explained by their high masses.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

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Article Astronomy & Astrophysics

KMT-2022-BLG-0440Lb: A new q < 10-4 microlensing planet with the central-resonant caustic degeneracy broken

Jiyuan Zhang, Weicheng Zang, Youn Kil Jung, Hongjing Yang, Andrew Gould, Takahiro Sumi, Shude Mao, Subo Dong, Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Kyu-Ha Hwang, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Qiyue Qian, Zhuokai Liu, Dan Maoz, Matthew T. Penny, Wei Zhu, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Ian A. Bond, Hirosane Fujii, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Naoki Koshimoto, Yutaka Matsubara, Sho Matsumoto, Shota Miyazaki, Yasushi Muraki, Arisa Okamura, Greg Olmschenk, Clement Ranc, Nicholas J. Rattenbury, Yuki Satoh, Daisuke Suzuki, Taiga Toda, Mio Tomoyoshi, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita

Summary: We present observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, which was covered by both the KMTNet survey and follow-up observations. The best fits were provided by binary-lens models with a central caustic, indicating a planet/host mass ratio of q = 0.75-1.00 x10(-4) at 1(sigma). The ability of the ongoing follow-up program for the KMTNet high-magnification events to detect challenging q < 10 (4) planets has been demonstrated.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

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Article Astronomy & Astrophysics

The mass of TOI-519 b: A close-in giant planet transiting a metal-rich mid-M dwarf

Taiki Kagetani, Norio Narita, Tadahiro Kimura, Teruyuki Hirano, Masahiro Ikoma, Hiroyuki Tako Ishikawa, Steven Giacalone, Akihiko Fukui, Takanori Kodama, Rebecca Gore, Ashley Schroeder, Yasunori Hori, Kiyoe Kawauchi, Noriharu Watanabe, Mayuko Mori, Yujie Zou, Kai Ikuta, Vigneshwaran Krishnamurthy, Jon Zink, Kevin Hardegree-Ullman, Hiroki Harakawa, Tomoyuki Kudo, Takayuki Kotani, Takashi Kurokawa, Nobuhiko Kusakabe, Masayuki Kuzuhara, Jerome P. de Leon, John H. Livingston, Jun Nishikawa, Masashi Omiya, Enric Palle, Hannu Parviainen, Takuma Serizawa, Huan-Yu Teng, Akitoshi Ueda, Motohide Tamura

Summary: We determined the mass of TOI-519 b, a substellar object orbiting an M-dwarf star, to be 0.463(-0.088)(+0.082) M-Jup using radial velocity measurements. The host star was found to have high metallicity and the lowest effective temperature among all stars hosting known close-in giant planets. The core mass of TOI-519 b can be explained by both core accretion and disk instability models, and the system is in line with the trend of high metallicity in M dwarfs with close-in giant planets and less massive giant planets around M dwarfs compared to FGK dwarfs.

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN (2023)

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Article Astronomy & Astrophysics

A Mini-Neptune Orbiting the Metal-poor K Dwarf BD+29 2654

Fei Dai, Kevin C. Schlaufman, Henrique Reggiani, Luke Bouma, Andrew W. Howard, Ashley Chontos, Daria Pidhorodetska, Judah Van Zandt, Joseph Akana M. Murphy, Ryan A. Rubenzahl, Alex S. Polanski, Jack Lubin, Corey Beard, Steven Giacalone, Rae Holcomb, Natalie M. Batalha, Ian Crossfield, Courtney Dressing, Benjamin Fulton, Daniel Huber, Howard Isaacson, Stephen R. Kane, Erik A. Petigura, Paul Robertson, Lauren M. Weiss, Alexander A. Belinski, Andrew W. Boyle, Christopher J. Burke, Amadeo Castro-Gonzalez, David R. Ciardi, Tansu Daylan, Akihiko Fukui, Holden Gill, Natalia M. Guerrero, Coel Hellier, Steve B. Howell, Jorge Lillo-Box, Felipe Murgas, Norio Narita, Enric Palle, David R. Rodriguez, Arjun B. Savel, Avi Shporer, Keivan G. Stassun, Stephanie Striegel, Douglas A. Caldwell, Jon M. Jenkins, George R. Ricker, Sara Seager, Roland Vanderspek, Joshua N. Winn

Summary: We report the discovery and Doppler mass measurement of a 7.4 days 2.3 R circle plus mini-Neptune around a metal-poor K dwarf BD+29 2654 (TOI-2018). The host star has a temperature of 4174 K, log g of 4.62, [Fe/H] of -0.58, M* of 0.57 Me, and R* of 0.62 R⊙. TOI-2018 b has a planetary mass of 9.2 M⊕ and its mass and radius are consistent with an Earthlike core with a hydrogen/helium envelope or an ice-rock mixture. The system is a potential target for transmission spectroscopy and metastable Helium observation.

ASTRONOMICAL JOURNAL (2023)

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Article Astronomy & Astrophysics

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

Takahiro Sumi, Naoki P. Koshimoto, David J. Bennett, Nicholas Rattenbury, Fumio Abe, Richard Barry, Aparna A. Bhattacharya, Ian 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, Clement Ranc, Yuki Satoh, Daisuke Suzuki, Mio Tomoyoshi, Paul . J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita

Summary: We present the first measurement of the mass function of free-floating planets (FFPs) or very wide orbit planets down to an Earth mass using the MOA-II microlensing survey. Six events, with short crossing times and small angular Einstein radii, are likely due to planets. The detection efficiency is measured for the first time using image-level simulations. The results show a power-law mass function for these events, implying the existence of FFPs or very wide orbit planets per star, with a total mass and number larger than wide orbit planets.

ASTRONOMICAL JOURNAL (2023)

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Article Astronomy & Astrophysics

Systematic KMTNet Planetary Anomaly Search. IX. Complete Sample of 2016 Prime-field Planets

In-Gu Shin, Jennifer Yee, Weicheng Zang, Hongjing Yang, Kyu-Ha A. Hwang, Cheongho D. Han, Andrew Gould, Andrzej Udalski, Ian Bond, Michael Albrow, Sun-Ju Chung, Youn Kil Jung, Yoon-Hyun Ryu, Yossi Shvartzvald, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Chung-Uk W. Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard Pogge, Przemek KMTNet Collaboration, Przemek Mroz, Michal K. Szymanski, Jan A. Skowron, Radoslaw Poleski, Igor Soszynski, Pawel Pietrukowicz, Szymon Kozlowski, Krzysztof Rybicki, Patryk Iwanek, Krzysztof P. Ulaczyk, Marcin Wrona, Mariusz Gromadzki, Richard OGLE Collaboration, Fumio Abe, Richard Barry, David Bennett, Aparna Bhattacharya, Hirosane Fujii, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Naoki J. Koshimoto, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Greg Olmschenk, Clement J. Ranc, Nicholas Rattenbury, Yuki Satoh, Takahiro Sumi, Daisuke Suzuki, Mio Tomoyoshi, Paul Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita, MOA Collaboration

Summary: This article reports the discovery of five new planets and one planet candidate, with a wide range of masses from Earth-class to super-Jupiter-class, found in 2016 KMTNet prime fields. These buried planets are located in both the disk and the bulge. The ultimate goal of this series is to build a complete planet sample, which will provide a better understanding of planet demographics in our Galaxy by complementing other planet detection methods.

ASTRONOMICAL JOURNAL (2023)

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Article Astronomy & Astrophysics

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

Naoki Koshimoto, Takahiro P. Sumi, David Bennett, Valerio Bozza, Przemek Mroz, Andrzej J. Udalski, Nicholas Rattenbury, Fumio Abe, Richard Barry, Aparna A. Bhattacharya, Ian 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, Clement Ranc, Yuki Satoh, Daisuke Suzuki, Mio J. Tomoyoshi, Paul Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita, MOA Collaboration

Summary: We report the discovery of low-mass free-floating planet (FFP) candidates from the analysis of MOA-II Galactic bulge survey data from 2006 to 2014. A statistical sample consisting of 3535 high-quality single-lens events with specific characteristics was identified, including a terrestrial-mass FFP candidate. The results suggest a large population of low-mass FFPs with a low detection efficiency for short-duration events.

ASTRONOMICAL JOURNAL (2023)

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