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Rotation of Low-mass Stars in Taurus with K2
Bouvier, J.; Rebull, L. M.; Stauffer, J. R. +4 more
We present an analysis of K2 light curves (LCs) from Campaigns 4 and 13 for members of the young (∼3 Myr) Taurus association, in addition to an older (∼30 Myr) population of stars that is largely in the foreground of the Taurus molecular clouds. Out of 156 of the highest-confidence Taurus members, we find that 81% are periodic. Our sample of young…
A He I upper atmosphere around the warm Neptune GJ 3470 b
Alonso-Floriano, F. J.; Sánchez-López, A.; López-Puertas, M. +24 more
High resolution transit spectroscopy has proven to be a reliable technique for the characterization of the chemical composition of exoplanet atmospheres. Taking advantage of the broad spectral coverage of the CARMENES spectrograph, we initiated a survey aimed at characterizing a broad range of planetary systems. Here, we report our observations of…
Dynamical friction in a Fuzzy Dark Matter universe
Spergel, David N.; Lisanti, Mariangela; Lancaster, Lachlan +3 more
We present an in-depth exploration of the phenomenon of dynamical friction in a universe where the dark matter is composed entirely of so-called Fuzzy Dark Matter (FDM), ultralight bosons of mass m~Script O(10-22) eV . We review the classical treatment of dynamical friction before presenting analytic results in the case of FDM for point…
AGN Feedback and Star Formation of Quasar Host Galaxies: Insights from the Molecular Gas
Ho, Luis C.; Bauer, Franz E.; Treister, Ezequiel +2 more
Molecular gas serves as a key probe of the complex interplay between black hole accretion and star formation in the host galaxies of active galactic nuclei (AGNs). We use CO(2-1) observations from a new Atacama Large Millimeter/submillimeter Array survey, in conjunction with literature measurements, to investigate the molecular gas properties of a…
Occurrence rates of planets orbiting M Stars: applying ABC to Kepler DR25, Gaia DR2, and 2MASS data
Terrien, Ryan; Ford, Eric B.; Hsu, Danley C.
We present robust planet occurrence rates for Kepler planet candidates around M stars for planet radii Rp = 0.5-4 R⊕ and orbital periods P = 0.5-256 d using the approximate Bayesian computation technique. This work incorporates the final Kepler DR25 planet candidate catalogue and data products and augments them with updated s…
ALMA and ROSINA detections of phosphorus-bearing molecules: the interstellar thread between star-forming regions and comets
Altwegg, K.; Balsiger, H.; Berthelier, J. J. +20 more
To understand how phosphorus (P)-bearing molecules are formed in star-forming regions, we have analysed the Atacama Large Millimeter/Submillimeter Array (ALMA) observations of PN and PO towards the massive star-forming region AFGL 5142, combined with a new analysis of the data of the comet 67P/Churyumov-Gerasimenko taken with the Rosetta Orbiter S…
A Pair of TESS Planets Spanning the Radius Valley around the Nearby Mid-M Dwarf LTT 3780
López-Morales, Mercedes; Latham, David W.; Quinn, Samuel N. +84 more
We present the confirmation of two new planets transiting the nearby mid-M dwarf LTT 3780 (TIC 36724087, TOI-732, V = 13.07, Ks = 8.204, Rs = 0.374 R⊙, Ms = 0.401 M⊙, d = 22 pc). The two planet candidates are identified in a single Transiting Exoplanet Survey Satellite sector and validated wit…
Keck/NIRC2 L'-band Imaging of Jovian-mass Accreting Protoplanets around PDS 70
Baranec, Christoph; Jensen-Clem, Rebecca; Duchêne, Gaspard +42 more
We present L'-band imaging of the PDS 70 planetary system with Keck/NIRC2 using the new infrared pyramid wave front sensor. We detected both PDS 70 b and c in our images, as well as the front rim of the circumstellar disk. After subtracting off a model of the disk, we measured the astrometry and photometry of both planets. Placing priors based on …
TOI-1338: TESS' First Transiting Circumbinary Planet
Trifonov, Trifon; Kostov, Veselin B.; Torres, Guillermo +65 more
We report the detection of the first circumbinary planet (CBP) found by Transiting Exoplanet Survey Satellite (TESS). The target, a known eclipsing binary, was observed in sectors 1 through 12 at 30 minute cadence and in sectors 4 through 12 at 2 minute cadence. It consists of two stars with masses of 1.1 M⊙ and 0.3 M⊙ on a s…
Evidence for Initial Mass Function Variation in Massive Early-Type Galaxies
Smith, Russell J.
The initial mass function (IMF), describing the distribution of birth masses of stars, plays a pivotal role in establishing the observable properties of galaxies. This article reviews the evidence for variation in the IMF of massive early-type galaxies (ETGs), especially from spectroscopic studies and from dynamical and gravitational lensing measu…