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Cabot, Samuel H. C.; Bello-Arufe, Aaron; Mendonça, João M.; Tronsgaard, René; Wong, Ian; Zhou, George; Buchhave, Lars A.; Fischer, Debra A.; Stassun, Keivan G.; Antoci, Victoria; Baker, David; Belinski, Alexander A.; Benneke, Björn; Bouma, Luke G.; Christiansen, Jessie L.; Collins, Karen A.; Goliguzova, Maria V.; Hagey, Simone; Jenkins, Jon M.; Jensen, Eric L. N.; Kidwell Jr, Richard C.; Laloum, Didier; Massey, Bob; McLeod, Kim K.; Latham, David W.; Morgan, Edward H.; Ricker, George; Safonov, Boris S.; Schlieder, Joshua E.; Seager, Sara; Shporer, Avi; Smith, Jeffrey C.; Srdoc, Gregor; Strakhov, Ivan A.; Torres, Guillermo; Twicken, Joseph D.; Vanderspek, Roland; Vezie, Michael; Winn, Joshua N.
The Astronomical journal, 11/2021, Letnik: 162, Številka: 5Journal Article
We present the discovery of TOI-1518b—an ultra-hot Jupiter orbiting a bright star (V = 8.95). The transiting planet is confirmed using high-resolution optical transmission spectra from EXPRES. It is inflated, with Rp = 1.875 ± 0.053 RJ, and exhibits several interesting properties, including a misaligned orbit (240.34 (+0.93, -0.98) degrees) and nearly grazing transit (b=0.9036 (+0.0061, -0.0053)). The planet orbits a fast-rotating F0 host star (Teff ≃ 7300 K) in 1.9 days and experiences intense irradiation. Notably, the TESS data show a clear secondary eclipse with a depth of 364 ± 28 ppm and a significant phase-curve signal, from which we obtain a relative day–night planetary flux difference of roughly 320 ppm and a 5.2σ detection of ellipsoidal distortion on the host star. Prompted by recent detections of atomic and ionized species in ultra-hot Jupiter atmospheres, we conduct an atmospheric cross-correlation analysis. We detect neutral iron (5.2σ), at K(p) = 157 (+68, -44) km/s and V(sys) = -16 (+2, -4), adding another object to the small sample of highly irradiated gas-giant planets with Fe detections in transmission. Detections so far favor particularly inflated gas giants with radii ≳1.78 R(J), which may be due to observational bias. With an equilibrium temperature of T(eq) = 2492 ± 38 K and a measured dayside brightness temperature of 3237 ± 59 K (assuming zero geometric albedo), TOI-1518b is a promising candidate for future emission spectroscopy to probe for a thermal inversion.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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