We present the discovery of a highly irradiated and moderately inflated ultra-hot Jupiter, TOI-1431b/MASCARA-5b (HD 201033b), first detected by NASA's Transiting Exoplanet Survey Satellite mission ...(TESS) and the Multi-site All-Sky CAmeRA (MASCARA). The signal was established to be of planetary origin through radial velocity measurements obtained using SONG, SOPHIE, FIES, NRES, and EXPRES, which show a reflex motion of \(K=294.1\pm1.1\) m s\(^{-1}\). A joint analysis of the TESS and ground-based photometry and radial velocity measurements reveals that TOI-1431b has a mass of \(M_{p}=3.12\pm0.18\) \(\rm{M_J}\) (\(990\pm60\) M\(_{\oplus}\)), an inflated radius of \(R_{p}=1.49\pm0.05\) \(\rm{R_J}\) (\(16.7\pm0.6\) R\(_{\oplus}\)), and an orbital period of \(P=2.650237\pm0.000003\) d. Analysis of the spectral energy distribution of the host star reveals that the planet orbits a bright (\(\mathrm{V}=8.049\) mag) and young (\(0.29^{+0.32}_{-0.19}\) Gyr) Am type star with \(T_{\rm eff}=7690^{+400}_{-250}\) \(\rm{K}\), resulting in a highly irradiated planet with an incident flux of \(\langle F \rangle=7.24^{+0.68}_{-0.64}\times\)10\(^9\) erg s\(^{-1}\) cm\(^{-2}\) (\(5300^{+500}_{-470}\mathrm{S_{\oplus}}\)) and an equilibrium temperature of \(T_{eq}=2370\pm70\) K. TESS photometry also reveals a secondary eclipse with a depth of \(127^{+4}_{-5}\)ppm as well as the full phase curve of the planet's thermal emission in the red-optical. This has allowed us to measure the dayside and nightside temperature of its atmosphere as \(T_\mathrm{day}=3004\pm64\) K and \(T_\mathrm{night}=2583\pm63\) K, the second hottest measured nightside temperature. The planet's low day/night temperature contrast (\(\sim\)420 K) suggests very efficient heat transport between the dayside and nightside hemispheres.
Review issue: the knowledge-based city Lever, W F; Howells, Jeremy R.L.; Simmie, James ...
Urban studies (Edinburgh, Scotland),
05/2002, Letnik:
39, Številka:
5-6
Journal Article
PDF