학술논문
KELT-25b and KELT-26b: A Hot Jupiter and a Substellar Companion Transiting Young A-stars Observed by TESS
Document Type
Working Paper
Author
Martínez, Romy Rodríguez; Gaudi, B. Scott; Rodriguez, Joseph E.; Zhou, George; Labadie-Bartz, Jonathan; Quinn, Samuel N.; Penev, Kaloyan Minev; Tan, Thiam-Guan; Latham, David W.; Paredes, Leonardo A.; Kielkopf, John; Addison, Brett C.; Wright, Duncan J.; Teske, Johanna K.; Howell, Steve B.; Ciardi, David R.; Ziegler, Carl; Stassun, Keivan G.; Johnson, Marshall C.; Eastman, Jason D.; Siverd, Robert J.; Beatty, Thomas G.; Bouma, Luke G.; Pepper, Joshua; Lund, Michael B.; Villanueva, Steven; Stevens, Daniel J.; Jensen, Eric L. N.; Kilby, Coleman; Cohen, David H.; Bayliss, Daniel; Bieryla, Allyson; Cargile, Phillip A.; Collins, Karen A.; Conti, Dennis M.; Colon, Knicole D.; Curtis, Ivan A.; DePoy, Darren L.; Evans, Phil A.; Feliz, Dax; Gregorio, Joao; Rothenberg, Jason; James, David J.; Penny, Matthew T.; Reed, Phillip A.; Relles, Howard M.; Stephens, Denise C.; Joner, Michael D.; Kuhn, Rudolf B.; Stockdale, Chris; Trueblood, Mark; Trueblood, Patricia; Yao, Xinyu; Zambelli, Roberto; Vanderspek, Roland; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Henry, Todd J.; James, Hodari-Sadiki; Jao, Wei-Chun; Wang, Sharon X.; Butler, R. Paul; Crane, Jeffrey D.; Thompson, Ian B.; Schectman, Stephen; Wittenmyer, Robert A.; Bedding, Timothy R.; Okumura, Jack; Plavchan, Peter; Bowler, Brendan P.; Horner, Jonathan; Kane, Stephen R.; Mengel, Matthew W.; Morton, Timothy D.; Tinney, C. G.; Zhang, Hui; Scott, Nicholas J.; Matson, Rachel A.; Everett, Mark E.; Tokovinin, Andrei; Mann, Andrew W.; Dragomir, Diana; Guenther, Maximilian N.; Ting, Eric B.; Fausnaugh, Michael; Glidden, Ana; Quintana, Elisa V.; Manner, Mark; Marshall, Jennifer L.; McLeod, Kim K.; Khakpash, Somayeh
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Subject
Language
Abstract
We present the discoveries of KELT-25b (TIC 65412605, TOI-626.01) and KELT-26b (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 \textit{TESS} photometry. KELT-25b is on a 4.40-day orbit around the V = 9.66 star CD-24 5016 ($T_{\rm eff} = 8280^{+440}_{-180}$ K, $M_{\star}$ = $2.18^{+0.12}_{-0.11}$ $M_{\odot}$), while KELT-26b is on a 3.34-day orbit around the V = 9.95 star HD 134004 ($T_{\rm eff}$ =$8640^{+500}_{-240}$ K, $M_{\star}$ = $1.93^{+0.14}_{-0.16}$ $M_{\odot}$), which is likely an Am star. We have confirmed the sub-stellar nature of both companions through detailed characterization of each system using ground-based and \textit{TESS} photometry, radial velocity measurements, Doppler Tomography, and high-resolution imaging. For KELT-25, we determine a companion radius of $R_{\rm P}$ = $1.64^{+0.039}_{-0.043}$ $R_{\rm J}$, and a 3-sigma upper limit on the companion's mass of $\sim64~M_{\rm J}$. For KELT-26b, we infer a planetary mass and radius of $M_{\rm P}$ = $1.41^{+0.43}_{-0.51}$ $M_{\rm J}$ and $R_{\rm P}$ = $1.940^{+0.060}_{-0.058}$ $R_{\rm J}$. From Doppler Tomographic observations, we find KELT-26b to reside in a highly misaligned orbit. This conclusion is weakly corroborated by a subtle asymmetry in the transit light curve from the \textit{TESS} data. KELT-25b appears to be in a well-aligned, prograde orbit, and the system is likely a member of a cluster or moving group.
Comment: 24 pages, 18 figures, 8 tables
Comment: 24 pages, 18 figures, 8 tables