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Herschel -ATLAS: revealing dust build-up and decline across gas, dust and stellar mass selected samples - I. Scaling relations
Ivison, R. J.; Baes, M.; Baker, A. J. +19 more
We present a study of the dust, stars and atomic gas (H I) in an H I-selected sample of local galaxies (z < 0.035) in the Herschel Astrophysical Terahertz Large Area Survey fields. This H I-selected sample reveals a population of very high gas fraction (>80 per cent), low stellar mass sources that appear to be in the earliest stages of their…
Signatures of Nitrogen Chemistry in Hot Jupiter Atmospheres
Madhusudhan, Nikku; MacDonald, Ryan J.
Inferences of molecular compositions of exoplanetary atmospheres have generally focused on carbon, hydrogen, and oxygen-bearing molecules. Recently, additional absorption in Hubble Space Telescope Wide Field Camera 3 (WFC3) transmission spectra around 1.55 µm has been attributed to nitrogen-bearing chemical species: NH3 or HCN. Th…
Surface Gravities for 228 M, L, and T Dwarfs in the NIRSPEC Brown Dwarf Spectroscopic Survey
Kirkpatrick, J. Davy; Burgasser, Adam J.; Logsdon, Sarah E. +6 more
We combine 131 new medium-resolution (R ∼ 2000) J-band spectra of M, L, and T dwarfs from the Keck NIRSPEC Brown Dwarf Spectroscopic Survey (BDSS) with 97 previously published BDSS spectra to study surface-gravity-sensitive indices for 228 low-mass stars and brown dwarfs spanning spectral types M5-T9. Specifically, we use an established set of spe…
Detection of nanoflare-heated plasma in the solar corona by the FOXSI-2 sounding rocket
Krucker, Säm; Narukage, Noriyuki; Glesener, Lindsay +4 more
The processes that heat the solar and stellar coronae to several million kelvins, compared with the much cooler photosphere (5,800 K for the Sun), are still not well known1. One proposed mechanism is heating via a large number of small, unresolved, impulsive heating events called nanoflares2. Each event would heat and cool qu…
An Updated 2017 Astrometric Solution for Betelgeuse
Kervella, P.; Decin, L.; Richards, A. M. S. +4 more
We provide an update for the astrometric solution for the Type II supernova progenitor Betelgeuse using the revised Hipparcos Intermediate Astrometric Data (HIAD) of van Leeuwen, combined with existing VLA and new e-MERLIN and ALMA positions. The 2007 Hipparcos refined abscissa measurements required the addition of so-called Cosmic Noise of 2.4 ma…
Gaia16apd - a link between fast and slowly declining type I superluminous supernovae
Lundqvist, P.; Wyrzykowski, Ł.; Kankare, E. +18 more
We present ultraviolet (UV), optical and infrared photometry and optical spectroscopy of the type Ic superluminous supernova (SLSN) Gaia16apd (=SN 2016eay), covering its evolution from 26 d before the g-band peak to 234.1 d after the peak. Gaia16apd was followed as a part of the NOT Unbiased Transient Survey (NUTS). It is one of the closest SLSNe …
Assessing distances and consistency of kinematics in Gaia/TGAS
Schönrich, Ralph; Aumer, Michael
We apply the statistical methods by Schönrich, Binney & Asplund to assess the quality of distances and kinematics in the Radial Velocity Experiment (RAVE)-Tycho-Gaia Astrometric Solution (TGAS) and Large Sky Area Multiobject Fiber Spectroscopic Telescope (LAMOST)-TGAS samples of Solar neighbourhood stars. These methods yield a nominal distance…
Cosmological constraints from thermal Sunyaev-Zeldovich power spectrum revisited
Seljak, U.; Horowitz, B.
Thermal Sunyaev-Zeldovich (tSZ) power spectrum is one of the most sensitive methods to constrain cosmological parameters, scaling as the amplitude σ _8^8. It is determined by the integral over the halo mass function multiplied by the total pressure content of clusters and further convolved by the cluster gas pressure profile. It has been shown tha…
The Great Observatories All-Sky LIRG Survey: Herschel Image Atlas and Aperture Photometry
Sanders, D. B.; Frayer, D. T.; Kim, D. -C. +24 more
Far-infrared images and photometry are presented for 201 Luminous and Ultraluminous Infrared Galaxies [LIRGs: log ({L}{IR}/{L}⊙ )=11.00{--}11.99, ULIRGs: log ({L}{IR}/{L}⊙ )=12.00{--}12.99], in the Great Observatories All-Sky LIRG Survey (GOALS), based on observations with the Herschel Space Observatory …
Molecular gas properties of a lensed star-forming galaxy at z 3.6: a case study
Kneib, J. -P.; Schaerer, D.; Rujopakarn, W. +12 more
We report on the galaxy MACSJ0032-arc at zCO = 3.6314 discovered during the Herschel Lensing snapshot Survey of massive galaxy clusters, and strongly lensed by the cluster MACS J0032.1+1808. The successful detections of its rest-frame ultraviolet (UV), optical, far-infrared (FIR), millimeter, and radio continua, and of its CO emission e…