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KELT-25b and KELT-26b: A Hot Jupiter and a Substellar Companion Transiting Young A-stars Observed by TESS

Rodríguez Martínez, Romy and Gaudi, B. Scott and Rodriguez, Joseph E. and Zhou, George and Labadie-Bartz, Jonathan and Quinn, Samuel N. and Penev, Kaloyan Minev and Tan, Thiam-Guan and Latham, David W. and Paredes, Leonardo A. and Kielkopf, John and Addison, Brett C. and Wright, Duncan J. and Teske, Johanna K. and Howell, Steve B. and Ciardi, David R. and Ziegler, Carl and Stassun, Keivan G. and Johnson, Marshall C. and Eastman, Jason D. and Siverd, Robert J. and Beatty, Thomas G. and Bouma, Luke G. and Pepper, Joshua and Lund, Michael B. and Villanueva, Steven and Stevens, Daniel J. and Jensen, Eric L. N. and Kilby, Coleman and Cohen, David H. and Bayliss, Daniel and Bieryla, Allyson and Cargile, Phillip A. and Collins, Karen A. and Conti, Dennis M. and Colón, Knicole D. and Curtis, Ivan A. and DePoy, Darren L. and Evans, Phil A. and Feliz, Dax and Gregorio, Joao and Rothenberg, Jason and James, David J. and Penny, Matthew T. and Reed, Phillip A. and Relles, Howard M. and Stephens, Denise C. and Joner, Michael D. and Kuhn, Rudolf B. and Stockdale, Chris and Trueblood, Mark and Trueblood, Patricia and Yao, Xinyu and Zambelli, Roberto and Vanderspek, Roland and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Henry, Todd J. and James, Hodari-Sadiki and Jao, Wei-Chun and Wang, Sharon X. and Butler, R. Paul and Crane, Jeffrey D. and Thompson, Ian B. and Schectman, Stephen and Wittenmyer, Robert A. and Bedding, Timothy R. and Okumura, Jack and Plavchan, Peter and Bowler, Brendan P. and Horner, Jonathan and Kane, Stephen R. and Mengel, Matthew W. and Morton, Timothy D. and Tinney, C. G. and Zhang, Hui and Scott, Nicholas J. and Matson, Rachel A. and Everett, Mark E. and Tokovinin, Andrei and Mann, Andrew W. and Dragomir, Diana and Guenther, Maximilian N. and Ting, Eric B. and Fausnaugh, Michael and Glidden, Ana and Quintana, Elisa V. and Manner, Mark and Marshall, Jennifer L. and McLeod, Kim K. and Khakpash, Somayeh (2020) KELT-25b and KELT-26b: A Hot Jupiter and a Substellar Companion Transiting Young A-stars Observed by TESS. Astronomical Journal, 160 (3). Art. No. 111. ISSN 1538-3881. https://resolver.caltech.edu/CaltechAUTHORS:20200420-082204988

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Abstract

We present the discoveries of KELT-25 b (TIC 65412605, TOI-626.01) and KELT-26 b (TIC 160708862, TOI-1337.01), two transiting companions orbiting relatively bright, early A stars. The transit signals were initially detected by the KELT survey and subsequently confirmed by Transiting Exoplanet Survey Satellite (TESS) photometry. KELT-25 b is on a 4.40 day orbit around the V = 9.66 star CD-24 5016 (T_(eff) = 8280⁺⁴⁴⁰₋₁₈₀ K, M⋆ = 2.18^(+0.12)_(−0.11) M⊙), while KELT-26 b is on a 3.34 day orbit around the V = 9.95 star HD 134004 (T_(eff) =8640⁺⁵⁰⁰₋₂₄₀ = K, M⋆ = 1.93^(+0.14)_(−0.16) M⊙), which is likely an Am star. We have confirmed the substellar nature of both companions through detailed characterization of each system using ground-based and TESS photometry, radial velocity measurements, Doppler tomography, and high-resolution imaging. For KELT-25, we determine a companion radius of R_P = 1.64^(+0.039)_(−0.043) R_J and a 3σ upper limit on the companion's mass of ~64 M J. For KELT-26 b, we infer a planetary mass and radius of M_p = 1.41^(+0.43)_(−0.51) M_J and R_P = 1.940^(+0.060)_(−0.058) R_J. From Doppler tomographic observations, we find KELT-26 b to reside in a highly misaligned orbit. This conclusion is weakly corroborated by a subtle asymmetry in the transit light curve from the TESS data. KELT-25 b appears to be in a well-aligned, prograde orbit, and the system is likely a member of the cluster Theia 449.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-3881/ab9f2dDOIArticle
https://arxiv.org/abs/1912.01017arXivDiscussion Paper
ORCID:
AuthorORCID
Rodríguez Martínez, Romy0000-0003-1445-9923
Gaudi, B. Scott0000-0003-0395-9869
Rodriguez, Joseph E.0000-0001-8812-0565
Zhou, George0000-0002-4891-3517
Labadie-Bartz, Jonathan0000-0002-2919-6786
Quinn, Samuel N.0000-0002-8964-8377
Penev, Kaloyan Minev0000-0003-4464-1371
Tan, Thiam-Guan0000-0001-5603-6895
Latham, David W.0000-0001-9911-7388
Kielkopf, John0000-0003-0497-2651
Howell, Steve B.0000-0002-2532-2853
Ciardi, David R.0000-0002-5741-3047
Ziegler, Carl0000-0002-0619-7639
Stassun, Keivan G.0000-0002-3481-9052
Johnson, Marshall C.0000-0002-5099-8185
Eastman, Jason D.0000-0003-3773-5142
Siverd, Robert J.0000-0001-5016-3359
Beatty, Thomas G.0000-0002-9539-4203
Pepper, Joshua0000-0002-3827-8417
Lund, Michael B.0000-0003-2527-1598
Villanueva, Steven0000-0001-6213-8804
Stevens, Daniel J.0000-0002-5951-8328
Jensen, Eric L. N.0000-0002-4625-7333
Bayliss, Daniel0000-0001-6023-1335
Bieryla, Allyson0000-0001-6637-5401
Collins, Karen A.0000-0001-6588-9574
Conti, Dennis M.0000-0003-2239-0567
Colón, Knicole D.0000-0001-8020-7121
Feliz, Dax0000-0002-2457-7889
James, David J.0000-0001-5160-4486
Penny, Matthew T.0000-0001-7506-5640
Kuhn, Rudolf B.0000-0002-4236-9020
Vanderspek, Roland0000-0001-6763-6562
Seager, Sara0000-0002-6892-6948
Winn, Joshua N.0000-0002-4265-047X
Jenkins, Jon M.0000-0002-4715-9460
Henry, Todd J.0000-0002-9061-2865
Jao, Wei-Chun0000-0003-0193-2187
Wang, Sharon X.0000-0002-6937-9034
Crane, Jeffrey D.0000-0002-5226-787X
Wittenmyer, Robert A.0000-0001-9957-9304
Bedding, Timothy R.0000-0001-5222-4661
Plavchan, Peter0000-0002-8864-1667
Bowler, Brendan P.0000-0003-2649-2288
Kane, Stephen R.0000-0002-7084-0529
Morton, Timothy D.0000-0002-8537-5711
Tinney, C. G.0000-0002-7595-0970
Scott, Nicholas J.0000-0003-1038-9702
Matson, Rachel A.0000-0001-7233-7508
Everett, Mark E.0000-0002-0885-7215
Mann, Andrew W.0000-0003-3654-1602
Dragomir, Diana0000-0003-2313-467X
Ting, Eric B.0000-0002-8219-9505
Glidden, Ana0000-0002-5322-2315
Quintana, Elisa V.0000-0003-1309-2904
Additional Information:© 2020 The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2019 December 2; revised 2020 June 16; accepted 2020 June 17; published 2020 August 14. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. The authors thank the anonymous referee for providing useful comments that improved the quality of this paper. J.E.R. was supported by the Harvard Future Faculty Leaders Postdoctoral fellowship. Work by G.Z. is provided by NASA through Hubble Fellowship grant HST-HF2-51402.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA under contract NAS 5-26555. D.J.S. is supported by Penn State University's Eberly Research Fellowship. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. Support for this work was provided by NASA through Hubble Fellowship grant HST-HF2-51399.001 awarded to J.K.T. by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA under contract NAS5-26555. M.N.G. acknowledges support from MIT's Kavli Institute as a Juan Carlos Torres Fellow. C.Z. is supported by a Dunlap Fellowship at the Dunlap Institute for Astronomy & Astrophysics, funded through an endowment established by the Dunlap family and the University of Toronto. K.G.S. acknowledges support from the Vanderbilt Office of the Provost through the Vanderbilt Initiative in Data-intensive Astrophysics. T.N. and A.Y. are also grateful to Mizuki Isogai, Akira Arai, and Hideyo Kawakita for their technical support on observations at Koyama Astronomical Observatory. C.D.K. was supported by the Swarthmore College Provost's Office. J.L.-B. acknowledges support from FAPESP (grant 2017/23731-1). K.P. acknowledges support from NASA grants 80NSSC18K1009 and NNX17AB94G. Funding for the TESS mission is provided by NASA's Science Mission directorate. This research has made use of the Exoplanet Follow-up Observation Program website, which is operated by the California Institute of Technology under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. This paper includes data collected by the TESS mission that are publicly available from the Mikulski Archive for Space Telescopes (MAST). This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC; https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This work makes use of observations from the LCO network. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Korea Astronomy and Space Science Institute (Republic of Korea). Some of the observations in the paper made use of the High-Resolution Imaging instrument Zorro at Gemini-South. Zorro was funded by the NASA Exoplanet Exploration Program and built at the NASA Ames Research Center by Steve B. Howell, Nic Scott, Elliott P. Horch, and Emmett Quigley. This research made use of Lightkurve, a Python package for Kepler and TESS data analysis (Lightkurve Collaboration, 2018). MINERVA-Australis is supported by Australian Research Council LIEF grant LE160100001, Discovery grant DP180100972, the Mount Cuba Astronomical Foundation, and institutional partners the University of Southern Queensland, UNSW Australia, MIT, Nanjing University, George Mason University, the University of Louisville, the University of California Riverside, the University of Florida, and the University of Texas at Austin. We respectfully acknowledge the traditional custodians of all lands throughout Australia and recognize their continued cultural and spiritual connection to the land, waterways, cosmos, and community. We pay our deepest respects to all elders, ancestors, and descendants of the Giabal, Jarowair, and Kambuwal nations, upon whose lands the MINERVA-Australis facility at Mt. Kent is situated. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. Facilities: FLWO 1.5 m (Tillinghast Reflector Echelle Spectrograph - , TRES); Kilodegree Extremely Little Telescope (KELT); MINiature Exoplanet Radial Velocity Array (MINERVA); Las Cumbres Observatory at Tenerife (LCO TFN); University of Louisville Manner Telescope (ULMT - , Mt. Lemmon); KeplerCam (FLWO 1.2 m); Stacja Obserwacji Tranzytów Egzoplanet w Suwałkach (SOTES); CROW Observatory; Koyama Astronomical Observatory (KAO); Gemini-South Zorro - . Software: EXOFASTv2 (Eastman et al. 2013; Eastman 2017), AstroImageJ (Collins et al. 2017), SPC (Buchhave et al. 2010).
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Harvard UniversityUNSPECIFIED
NASA Hubble FellowshipHST-HF2-51402.001-A
NASANAS 5-26555
Pennsylvania State UniversityUNSPECIFIED
Eberly College of ScienceUNSPECIFIED
Pennsylvania Space Grant ConsortiumUNSPECIFIED
NASA Hubble FellowshipHST-HF2-51399.001
Massachusetts Institute of Technology (MIT)UNSPECIFIED
Dunlap Institute for Astronomy and AstrophysicsUNSPECIFIED
University of TorontoUNSPECIFIED
Vanderbilt Initiative in Data-Intensive Astrophysics (VIDA)UNSPECIFIED
Swarthmore CollegeUNSPECIFIED
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)2017/23731-1
NASA80NSSC18K1009
NASANNX17AB94G
Gaia Multilateral AgreementUNSPECIFIED
Australian Research CouncilLE160100001
Australian Research CouncilDP180100972
Mt. Cuba Astronomical FoundationUNSPECIFIED
Subject Keywords:Exoplanet astronomy ; Transit photometry ; Radial velocity
Issue or Number:3
Classification Code:Unified Astronomy Thesaurus concepts: Exoplanet astronomy (486); Transit photometry (1709); Radial velocity (1332)
Record Number:CaltechAUTHORS:20200420-082204988
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200420-082204988
Official Citation:Romy Rodríguez Martínez et al 2020 AJ 160 111
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102643
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Apr 2020 15:51
Last Modified:14 Aug 2020 18:51

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