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

被引：30

作者：

Martinez, Romy Rodriguez ^{[1
]}

Gaudi, B. Scott ^{[1
]}

Rodriguez, Joseph E. ^{[2
]}

Zhou, George ^{[2
]}

Labadie-Bartz, Jonathan ^{[3
]}

Quinn, Samuel N. ^{[2
]}

Penev, Kaloyan ^{[4
]}

Tan, Thiam-Guan ^{[5
]}

Latham, David W. ^{[2
]}

Paredes, Leonardo A. ^{[6
]}

Kielkopf, John F. ^{[7
]}

Addison, Brett ^{[8
]}

Wright, Duncan J. ^{[8
]}

Teske, Johanna ^{[9
]}

Howell, Steve B. ^{[10
]}

Ciardi, David ^{[11
]}

Ziegler, Carl ^{[12
]}

Stassun, Keivan G. ^{[13
,14
]}

Johnson, Marshall C. ^{[15
]}

Eastman, Jason D. ^{[2
]}

Siverd, Robert J. ^{[16
]}

Beatty, Thomas G. ^{[17
,18
]}

Bouma, Luke ^{[19
]}

Bedding, Timothy ^{[20
]}

Pepper, Joshua ^{[21
]}

Winn, Joshua ^{[19
]}

Lund, Michael B. ^{[11
]}

Villanueva, Steven, Jr. ^{[22
,23
]}

Stevens, Daniel J. ^{[24
,25
]}

Jensen, Eric L. N. ^{[26
]}

Kilby, Coleman ^{[26
]}

Crane, Jeffrey D. ^{[9
,27
]}

Tokovinin, Andrei ^{[28
]}

Everett, Mark E. ^{[29
]}

Tinney, C. G. ^{[30
]}

Fausnaugh, Michael ^{[22
,23
]}

Cohen, David H. ^{[26
]}

Bayliss, Daniel ^{[31
,32
]}

Bieryla, Allyson ^{[2
]}

Cargile, Phillip A. ^{[2
]}

Collins, Karen A. ^{[2
]}

Conti, Dennis M. ^{[33
]}

Colon, Knicole D. ^{[34
]}

Curtis, Ivan A. ^{[35
]}

Depoy, D. L. ^{[36
,37
]}

Evans, Phil ^{[38
]}

Feliz, Dax L. ^{[13
]}

Gregorio, Joao ^{[39
,40
]}

Rothenberg, Jason ^{[41
]}

James, David J. ^{[2
,42
]}

机构：

[1] Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA

[2] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[3] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226,Cidade Univ, BR-05508900 Sao Paulo, SP, Brazil

[4] Univ Texas Dallas, Dept Phys, 800 West Campbell Rd, Richardson, TX 75080 USA

[5] Perth Exoplanet Survey Telescope, Perth, WA, Australia

[6] Georgia State Univ, Dept Phys & Astron, Atlanta, GA 30302 USA

[7] Univ Louisville, Dept Phys & Astron, Louisville, KY 40292 USA

[8] Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia

[9] Carnegie Inst Sci, The Observatories, 813 Santa Barbara St, Pasadena, CA 91101 USA

[10] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[11] CALTECH IPAC NASA Exoplanet Sci Inst, 1200 East Calif Ave, Pasadena, CA 91125 USA

[12] Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON M5S 3H4, Canada

[13] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[14] Fisk Univ, Dept Phys, 1000 17th Ave North, Nashville, TN 37208 USA

[15] Cumbres Observ, 6740 Cortona Dr,Suite 102, Goleta, CA 93117 USA

[16] Northern Operat Ctr, Gemini Observ, 670 North Aohoku Pl, Hilo, HI 96720 USA

[17] Univ Arizona, Dept Astron, Tucson, AZ 85721 USA

[18] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[19] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[20] Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia

[21] Lehigh Univ, Dept Phys, 16 Mem Dr East, Bethlehem, PA 18015 USA

[22] MIT, Dept Phys, Cambridge, MA 02139 USA

[23] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[24] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA

[25] Penn State Univ, Ctr Exoplanets & Habitable Worlds, 525 Davey Lab, University Pk, PA 16802 USA

[26] Swarthmore Coll, Dept Phys & Astron, Swarthmore, PA 19081 USA

[27] Carnegie Inst Sci, Dept Terr Magnetism, 5241 Broad Branch Rd NW, Washington, DC 20015 USA

[28] Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile

[29] Natl Opt Astron Observ, 950 North Cherry Ave, Tucson, AZ 85719 USA

[30] UNSW Sydney, Sch Phys, Exoplanetary Sci UNSW, Sydney, NSW 2052, Australia

[31] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

[32] Univ Warwick, Ctr Exoplanets & Habitabil, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

[33] Amer Assoc Variable Star Observers, 49 Bay State Rd, Cambridge, MA 02138 USA

[34] NASA, Exoplanets & Stellar Astrophys Lab, Goddard Space Flight Ctr, Code 667, Greenbelt, MD 20771 USA

[35] Ivan Curtis Private Observ, Adelaide, SA, Australia

[36] Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 USA

[37] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[38] El Sauce Observ, Rio Hurtado, Coquimbo, Chile

[39] Atalaia Grp, Portalegre, Portugal

[40] CROW Observ, Portalegre, Portugal

[41] Univ Wyoming, Dept Phys & Astron, 1000 East Univ Ave,Dept 3905, Laramie, WY 82071 USA

[42] Harvard Univ, Black Hole Initiat, 20 Garden St, Cambridge, MA 02138 USA

[43] Brigham Young Univ, Dept Phys & Astron, Provo, UT 84602 USA

[44] South African Astron Observ, POB 9, ZA-7935 Cape Town, South Africa

[45] Southern African Large Telescope, POB 9, ZA-7935 Cape Town, South Africa

[46] Spot Observ, Nashville, TN 37206 USA

[47] Wellesley Coll, Dept Astron, Wellesley, MA 02481 USA

[48] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[49] Kutztown State Univ, Dept Phys Sci, Kutztown, PA 19530 USA

[50] Hazelwood Observ, Churchill, Vic, Australia

来源：

ASTRONOMICAL JOURNAL | 2020年 / 160卷 / 03期

基金：

澳大利亚研究理事会; 美国国家航空航天局; 巴西圣保罗研究基金会;

关键词：

ROTATIONAL VELOCITIES; PLANET; DWARF; EXOPLANETS; SOUTH; SUN; ATMOSPHERES; ABUNDANCE; SELECTION; PROJECT;

D O I：

10.3847/1538-3881/ab9f2d

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the discoveries of KELT-25 b (TIC 65412605, TOI-626.01) and KELT-26 b (TIC 160708862, TOI1337.01), 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(-180)(+440) K, M-star = 2.18(-0.11)(+0.12) M-circle dot), while KELT-26 b is on a 3.34 day orbit around the V = 9.95 star HD 134004 (T-eff = 8640(-240)(+500) K, M-circle dot = 1.93(-0.16)(+0.14) M-circle dot), 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(-0.043)(+0.039) R-J and a 3 sigma upper limit on the companion's mass of similar to 64 M-J. For KELT-26 b, we infer a planetary mass and radius of M-P = 1.41(-0.51)(+0.43) M-J and R-P = 1.94(-0.058)(+0.060) 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.

引用

页数：21

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