Kevin Apps
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View article: The Initial Mass Function Based on the Full-sky 20 pc Census of ∼3600 Stars and Brown Dwarfs
The Initial Mass Function Based on the Full-sky 20 pc Census of ∼3600 Stars and Brown Dwarfs Open
A complete accounting of nearby objects—from the highest-mass white dwarf progenitors down to low-mass brown dwarfs—is now possible, thanks to an almost complete set of trigonometric parallax determinations from Gaia, ground-based surveys,…
View article: HD 110067 is a Wide Hierarchical Triple System
HD 110067 is a Wide Hierarchical Triple System Open
We report that HD 110067, the recently announced host star of a resonant sextuplet of transiting sub-Neptunes, is not a single star as claimed in the discovery paper, but a wide hierarchical triple. The K0 V planet hosting star ( V = 8.4 m…
View article: The Initial Mass Function Based on the Full-sky 20-pc Census of $\sim$3,600 Stars and Brown Dwarfs
The Initial Mass Function Based on the Full-sky 20-pc Census of $\sim$3,600 Stars and Brown Dwarfs Open
A complete accounting of nearby objects -- from the highest-mass white dwarf progenitors down to low-mass brown dwarfs -- is now possible, thanks to an almost complete set of trigonometric parallax determinations from Gaia, ground-based su…
View article: HD 110067 is a wide hierarchical triple system
HD 110067 is a wide hierarchical triple system Open
We report that HD 110067, the recently announced host star of a resonant sextuplet of transiting sub-Neptunes, is not a single star as claimed in the discovery paper, but a wide hierarchical triple. The K0 V planet hosting star (V = 8.4 ma…
View article: M2K. II. A triple-planet system orbiting HIP 57274
M2K. II. A triple-planet system orbiting HIP 57274 Open
Doppler observations from Keck Observatory have revealed a triple-planet system orbiting the nearby K4V star, HIP 57274. The inner planet, HIP 57274b, is a super-Earth with Msin i = 11.6 M ⊕ (0.036M Jup), an orbital period of 8.135 0.004 d…
View article: Spectral analysis of ultra-cool white dwarfs polluted by planetary debris
Spectral analysis of ultra-cool white dwarfs polluted by planetary debris Open
We identify two ultra-cool (${T_\mathrm{eff}}\lt 4000$ K) metal-polluted (DZ) white dwarfs WD J2147−4035 and WD J1922+0233 as the coolest and second coolest DZ stars known to date with ${T_\mathrm{eff}}\approx 3050$ K and ${T_\mathrm{eff}}…
View article: Spectral analysis of ultra-cool white dwarfs polluted by planetary debris
Spectral analysis of ultra-cool white dwarfs polluted by planetary debris Open
We identify two ultra-cool ($T_\mathrm{eff} < 4000$ K) metal-polluted (DZ) white dwarfs WDJ2147$-$4035 and WDJ1922$+$0233 as the coolest and second coolest DZ stars known to date with $T_\mathrm{eff} \approx 3050$ K and $T_\mathrm{eff} \ap…
View article: Discovery of a Uniquely Cool and Compact Source at 28 pc from the Sun
Discovery of a Uniquely Cool and Compact Source at 28 pc from the Sun Open
We present the discovery of what appears to be both a uniquely cool and old white dwarf (WD) within 30 pc of the Sun. DES J214756.46-403529.3 is detected in four separate surveys, 50° away from the Galactic Plane. The combination of its ve…
View article: Discovery of a uniquely cool and compact source at 28 parsecs from the Sun
Discovery of a uniquely cool and compact source at 28 parsecs from the Sun Open
We present the discovery of what appears to be both a uniquely cool and old white dwarf within 30 parsecs of the sun. DES J214756.46-403529.3 is detected in four separate surveys, 50 degrees away from the Galactic Plane. The combination of…
View article: Discovery of a uniquely cool and compact source at 28 parsecs from the\n Sun
Discovery of a uniquely cool and compact source at 28 parsecs from the\n Sun Open
We present the discovery of what appears to be both a uniquely cool and old\nwhite dwarf within 30 parsecs of the sun. DES J214756.46-403529.3 is detected\nin four separate surveys, 50 degrees away from the Galactic Plane. The\ncombination…