HAT-P-68b: A TRANSITING HOT JUPITER AROUND A K5 DWARF STAR

We report the discovery by the ground-based HATNet survey of the transiting exoplanet HAT-P-68b, which has a mass of 0.724 ± 0.043 M_Jupiter , and radius of 1.072 ± 0.012 R_Jupiter. The planet is in a circular P = 2.2984 day orbit around a moderately bright V = 13.937 ± 0.030 magnitude K dwarf star of mass 0.673 M_Sun , and radius 0.6726 ± 0.0069 R_Sun . The planetary nature of this system is confirmed through follow-up transit photometry obtained with the FLWO 1.2 m telescope, high-precision RVs measured using Keck-I/HIRES, FLWO 1.5 m/TRES, and OHP 1.9 m/Sophie, and high-spatial-resolution speckle imaging from WIYN 3.5 m/DSSI. HAT-P-68 is at an ecliptic latitude of +3degrees and outside the field of view of both the NASA TESS primary mission and the K2 mission. The large transit depth of 0.036 mag (r-band) makes HAT-P-68b a promising target for atmospheric characterization via transmission spectroscopy

Clusters of Galaxies: Mass Determination Methods, Biases, And Precision Cosmology

The mass-function of galaxy clusters in the Universe reveals information about the formation, evolution, and processes behind celestial objects. Previous attempts to probe masses of clusters have depended on various methods, including kinematics and dynamics, X-ray observations, and gravitational lensing. When studies use X-ray observations to derive cluster masses, they assume that the gas within the cluster is in hydrostatic equilibrium (HSE). The problem with this assumption is that clusters are not necessarily in HSE. As such, HSE mass measurements are often compared with more reliable lensing masses in order to reveal the systematic bias of the HSE assumption. In this work, we investigate the uncertainties in the bias of mass determination for a sample of 25 galaxy clusters using precision cosmology. This will enable the use of clusters -- the most massive virialized systems in the universe -- as accurate tools in determining cosmological parameters including the dark-matter and dark-energy density of the universe. In this work, we measure a mean mass bias of $0.9\pm0.09$ -- consistent with the current literature

HAT-P-68b: A Transiting Hot Jupiter around a K5 Dwarf Star

We report the discovery by the ground-based HATNet survey of the transiting exoplanet HAT-P-68b, which has a mass of 0.724 $\pm$ 0.043 $M_{Jup}$, and radius of 1.072 $\pm$ 0.012 $R_{Jup}$. The planet is in a circular P = 2.2984-day orbit around a moderately bright V = 13.937 $\pm$ 0.030 magnitude K dwarf star of mass 0.673 $+$ 0.020 $-$0.014 $M_{\odot}$, and radius 0.6726 $\pm$ 0.0069 $R_{\odot}$. The planetary nature of this system is confirmed through follow-up transit photometry obtained with the FLWO~1.2m telescope, high-precision RVs measured using Keck-I/HIRES, FLWO~1.5m/TRES, and OHP~1.9m/Sophie, and high-spatial-resolution speckle imaging from WIYN~3.5m/DSSI. HAT-P-68 is at an ecliptic latitude of $+3^{\circ}$ and outside the field of view of both the NASA TESS primary mission and the K2 mission. The large transit depth of 0.036 mag ($r$-band) makes HAT-P-68b a promising target for atmospheric characterization via transmission spectroscopy.Comment: submitted to AJ on October 1, 2020; accepted on October 27. 15 pages, 8 figures, 6 table