Search Publications
Slowing of the Solar Wind in the Outer Heliosphere
Stern, S. Alan; Weaver, Harold A.; Young, Leslie A. +15 more
This study provides a deeper understanding of how the solar wind evolves with increasing distance from the Sun as it encounters an increasing amount of interstellar material. This work extends our prior work by (1) extending the solar wind proton data radial profiles for New Horizons (NH) out to nearly 43 au, (2) quantifying the observed amount of…
The Main Sequence at z ∼ 1.3 Contains a Sizable Fraction of Galaxies with Compact Star Formation Sizes: A New Population of Early Post-starbursts?
Daddi, E.; Elbaz, D.; Le Floc'h, E. +20 more
Atacama Large Millimeter/submillimeter Array (ALMA) measurements for 93 Herschel-selected galaxies at 1.1 ≤ z ≤ 1.7 in COSMOS reveal a sizable (>29%) population with compact star formation (SF) sizes, lying on average >×3.6 below the optical stellar mass (M ⋆)-size relation of disks. This sample widely spans the star-forming main …
Flaring Activity of Proxima Centauri from TESS Observations: Quasiperiodic Oscillations during Flare Decay and Inferences on the Habitability of Proxima b
Pál, András; Moór, Attila; Vida, Krisztián +3 more
We analyze the light curve of the M5.5 dwarf Proxima Centauri obtained by the Transiting Exoplanet Survey Satellite (TESS) in Sectors 11 and 12. In the ≈50 day long light curve we identified and analyzed 72 flare events. The flare rate was 1.49 events per day; in total, 7.2% of the observing time was classified as flaring. The estimated flare ener…
Back to the Lithium Plateau with the [Fe/H] < -6 Star J0023+0307
Aguado, David S.; Allende Prieto, Carlos; Rebolo, Rafael +1 more
We present an analysis of the Ultraviolet and Visual Echelle Spectrograph (UVES) high-resolution spectroscopic observations at the 8.2 m Very Large Telescope of J0023+0307, a main-sequence extremely iron-poor dwarf star. We are unable to detect iron lines in the spectrum but derive [Fe/H] < -6.1 from the Ca II resonance lines assuming [Ca/Fe] ≥…
The SPIRITS Sample of Luminous Infrared Transients: Uncovering Hidden Supernovae and Dusty Stellar Outbursts in Nearby Galaxies
Williams, Robert E.; Kilpatrick, Charles D.; Tinyanont, Samaporn +23 more
We present a systematic study of the most luminous (M IR [Vega magnitudes] brighter than -14) infrared (IR) transients discovered by the SPitzer InfraRed Intensive Transients Survey (SPIRITS) between 2014 and 2018 in nearby galaxies (D < 35 Mpc). The sample consists of nine events that span peak IR luminosities of M [4.5],peak
The COS CGM Compendium. II. Metallicities of the Partial and Lyman Limit Systems at z ≲ 1
Lehner, Nicolas; Howk, J. Christopher; O'Meara, John M. +3 more
We present the results from our COS circumgalactic medium (CGM) compendium (CCC), a survey of the CGM at z ≲ 1 using H I-selected absorbers with 15 < {log}{N}{{H}{{I}}} < 19. We focus here on 82 partial Lyman limit systems (pLLSs, 16.2 ≤ {log}{N}{{H}{{I}}} < 17.2) and 29 LLSs (17.2 ≤ {log}{N}{{H}{{I}}} <…
Evidence for Sub-Chandrasekhar Type Ia Supernovae from Stellar Abundances in Dwarf Galaxies
Kovalev, Mikhail; McWilliam, Andrew; Shen, Ken J. +6 more
There is no consensus on the progenitors of Type Ia supernovae (SNe Ia) despite their importance for cosmology and chemical evolution. We address this question using our previously published catalogs of Mg, Si, Ca, Cr, Fe, Co, and Ni abundances in dwarf galaxy satellites of the Milky Way (MW) to constrain the mass at which the white dwarf (WD) exp…
Solar Chromospheric Temperature Diagnostics: A Joint ALMA-Hα Analysis
Cranmer, Steven R.; Reardon, Kevin P.; Uitenbroek, Han +4 more
We present the first high-resolution, simultaneous observations of the solar chromosphere in the optical and millimeter wavelength ranges, obtained with the Atacama Large Millimeter Array (ALMA) and the Interferometric Bidimensional Spectrometer at the Dunn Solar Telescope. In this paper we concentrate on the comparison between the brightness temp…
Reverberation Measurements of the Inner Radii of the Dust Tori in Quasars
Minezaki, Takeo; Yoshii, Yuzuru; Enya, Keigo +8 more
We present the results of a dust-reverberation survey of quasars at redshifts z < 0.6. We found a delayed response of the K-band flux variation after the optical flux variation in 25 out of 31 targets, and obtained the lag time between them for 22 targets. Combined with the results for nearby Seyfert galaxies, we provide the largest homogeneous…
Optically Faint Massive Balmer Break Galaxies at z > 3 in the CANDELS/GOODS Fields
Barro, Guillermo; Pérez-González, Pablo G.; Eliche-Moral, M. Carmen +7 more
We present a sample of 33 Balmer break galaxies (BBGs) selected as Hubble Space Telescope/F160W dropouts in the deepest CANDELS/GOODS fields (H ≳ 27.3 mag) but relatively bright in Spitzer/IRAC ([3.6], [4.5] < 24.5 mag), implying red colors (median and quartiles: < H-[3.6]> ={3.1}2.83.4 {mag}). Half of these BBGs are…