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The Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0-T8 Dwarfs with UKIRT
Magnier, Eugene A.; Dupuy, Trent J.; Liu, Michael C. +1 more
We present parallaxes, proper motions, and J-band photometry for 348 L and T dwarfs measured using the wide-field near-infrared camera WFCAM on the United Kingdom Infrared Telescope. This is the largest single batch of infrared parallaxes for brown dwarfs to date. Our parallaxes have a median uncertainty of 3.5 mas, similar to most previous ground…
A Sub-Neptune-sized Planet Transiting the M2.5 Dwarf G 9-40: Validation with the Habitable-zone Planet Finder
Endl, Michael; Mahadevan, Suvrath; Terrien, Ryan +32 more
We validate the discovery of a 2-Earth-radii sub-Neptune-sized planet around the nearby high-proper-motion M2.5 dwarf G 9-40 (EPIC 212048748), using high-precision, near-infrared (NIR) radial velocity (RV) observations with the Habitable-zone Planet Finder (HPF), precision diffuser-assisted ground-based photometry with a custom narrowband photomet…
AGN-driven outflows and the AGN feedback efficiency in young radio galaxies
Morganti, R.; Holt, J.; Tadhunter, C. +2 more
Active galactic nuclei (AGN) feedback operated by the expansion of radio jets can play a crucial role in driving gaseous outflows on galaxy scales. Galaxies hosting young radio AGN, whose jets are in the first phases of expansion through the surrounding interstellar medium (ISM), are the ideal targets to probe the energetic significance of this me…
Is there Na I in the atmosphere of HD 209458b?. Effect of the centre-to-limb variation and Rossiter-McLaughlin effect in transmission spectroscopy studies
Alonso-Floriano, F. J.; Sánchez-López, A.; López-Puertas, M. +22 more
HD 209458b was the first transiting planet discovered, and the first for which an atmosphere, in particular Na I, was detected. With time, it has become one of the most frequently studied planets, with a large diversity of atmospheric studies using low- and high-resolution spectroscopy. Here, we present transit spectroscopy observations of HD 2094…
On the Accuracy of Time-delay Cosmography in the Frontier Fields Cluster MACS J1149.5+2223 with Supernova Refsdal
Grillo, C.; Rosati, P.; Mercurio, A. +3 more
We study possible systematic effects on the values of the cosmological parameters measured through strong lensing analyses of the Hubble Frontier Field galaxy cluster MACS J1149.5+2223. We use the observed positions of a large set of spectroscopically selected multiple images, including those of supernova "Refsdal" with their published time delays…
An ALMA Survey of H2CO in Protoplanetary Disks
Wilner, David J.; Cleeves, L. Ilsedore; Andrews, Sean M. +13 more
H2CO is one of the most abundant organic molecules in protoplanetary disks and can serve as a precursor to more complex organic chemistry. We present an Atacama Large Millimeter/submillimeter Array survey of H2CO toward 15 disks covering a range of stellar spectral types, stellar ages, and dust continuum morphologies. H2…
Possible evidence of ongoing planet formation in AB Aurigae. A showcase of the SPHERE/ALMA synergy
Pantin, E.; Milli, J.; Boccaletti, A. +8 more
Context. Planet formation is expected to take place in the first million years of a planetary system through various processes, which remain to be tested through observations.
Aims: With the recent discovery, using ALMA, of two gaseous spiral arms inside the ∼120 au cavity and connected to dusty spirals, the famous protoplanetary disk around …
Catalogue of new Herbig Ae/Be and classical Be stars. A machine learning approach to Gaia DR2
Mendigutía, I.; Mowlavi, N.; Baines, D. +4 more
Context. The intermediate-mass pre-main sequence Herbig Ae/Be stars are key to understanding the differences in formation mechanisms between low- and high-mass stars. The study of the general properties of these objects is hampered by the lack of a well-defined, homogeneous sample, and because few and mostly serendipitously discovered sources are …
A Dynamical Mass of 70 ± 5 MJup for Gliese 229B, the First T Dwarf
Dupuy, Trent J.; Bardalez Gagliuffi, Daniella C.; Bowler, Brendan P. +4 more
We combine Keck/HIRES radial velocities, imaging with HiCIAO/Subaru and the Hubble Space Telescope, and absolute astrometry from Hipparcos and Gaia to measure a dynamical mass of 70 ± 5 ${M}_{\mathrm{Jup}}$ for the brown dwarf companion to Gl 229. Gl 229B was the first imaged brown dwarf to show clear signs of methane in its atmosphere. Cooling mo…
The NASA Ames PAH IR Spectroscopic Database: The Laboratory Spectra
Boersma, C.; Allamandola, L. J.; Peeters, E. +7 more
The astronomical emission features, formerly known as the unidentified infrared bands, are now commonly ascribed to polycyclic aromatic hydrocarbons (PAHs). The laboratory experiments and computational modeling performed at NASA Ames Research Center generated a collection of PAH IR spectra that have been used to test and refine the PAH model. Thes…