TY - JOUR
T1 - The Continuing Search for Evidence of Tidal Orbital Decay of Hot Jupiters
AU - Patra, Kishore C.
AU - Winn, Joshua N.
AU - Holman, Matthew J.
AU - Gillon, Michael
AU - Burdanov, Artem
AU - Jehin, Emmanuel
AU - Delrez, Laetitia
AU - Pozuelos, Francisco J.
AU - Barkaoui, Khalid
AU - Benkhaldoun, Zouhair
AU - Narita, Norio
AU - Fukui, Akihiko
AU - Kusakabe, Nobuhiko
AU - Kawauchi, Kiyoe
AU - Terada, Yuka
AU - Bouma, L. G.
AU - Weinberg, Nevin N.
AU - Broome, Madelyn
N1 - Publisher Copyright:
© 2020. The American Astronomical Society. All rights reserved..
PY - 2020/4
Y1 - 2020/4
N2 - Many of the known hot Jupiters are formally unstable to tidal orbital decay. The only hot Jupiter for which orbital decay has been directly detected is WASP-12, for which transit-timing measurements spanning more than a decade have revealed that the orbital period is decreasing at a rate of, corresponding to a reduced tidal quality factor of about 2 × 105. Here, we present a compilation of transit-timing data for WASP-12 and 11 other systems that are especially favorable for detecting orbital decay: KELT-16; WASP-18, 19, 43, 72, 103, 114, and 122; HAT-P-23; HATS-18; and OGLE-TR-56. For most of these systems we present new data that extend the time baseline over which observations have been performed. None of the systems besides WASP-12 display convincing evidence for period changes, with typical upper limits on dP/dt on the order of 10-9 or 10-10, and lower limits on the reduced tidal quality factor on the order of 105. One possible exception is WASP-19, which shows a statistically significant trend, although it may be a spurious effect of starspot activity. Further observations are encouraged.
AB - Many of the known hot Jupiters are formally unstable to tidal orbital decay. The only hot Jupiter for which orbital decay has been directly detected is WASP-12, for which transit-timing measurements spanning more than a decade have revealed that the orbital period is decreasing at a rate of, corresponding to a reduced tidal quality factor of about 2 × 105. Here, we present a compilation of transit-timing data for WASP-12 and 11 other systems that are especially favorable for detecting orbital decay: KELT-16; WASP-18, 19, 43, 72, 103, 114, and 122; HAT-P-23; HATS-18; and OGLE-TR-56. For most of these systems we present new data that extend the time baseline over which observations have been performed. None of the systems besides WASP-12 display convincing evidence for period changes, with typical upper limits on dP/dt on the order of 10-9 or 10-10, and lower limits on the reduced tidal quality factor on the order of 105. One possible exception is WASP-19, which shows a statistically significant trend, although it may be a spurious effect of starspot activity. Further observations are encouraged.
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U2 - 10.3847/1538-3881/ab7374
DO - 10.3847/1538-3881/ab7374
M3 - Article
AN - SCOPUS:85085065857
SN - 0004-6256
VL - 159
JO - Astronomical Journal
JF - Astronomical Journal
IS - 4
M1 - 150
ER -