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Contamination in TESS Light Curves: The Case of the Fast Yellow Pulsating Supergiants
Bell, Keaton J.; Pedersen, May G.
Given its large plate scale of 21″ pixel-1, analyses of data from the Transiting Exoplanet Survey Satellite (TESS) space telescope must be wary of source confusion from blended light curves, which creates the potential to attribute observed photometric variability to the wrong astrophysical source. We explore the impact of light curve c…
Hidden Cooling Flows in clusters of Galaxies II: a wider sample
Fabian, A. C.; Pinto, C.; Ferland, G. J. +3 more
We have recently uncovered Hidden Cooling Flows (HCFs) in the XMM Reflection Grating Spectrometer spectra of three clusters of galaxies; Centaurus, Perseus, and A1835. Here, we search for them in a wider sample of objects: the X-ray brightest group NGC 5044; four moderate X-ray luminosity clusters Sersic 159, A262, A2052, and RX J0821; and three h…
Detection of Carbon Monoxide's 4.6 Micron Fundamental Band Structure in WASP-39b's Atmosphere with JWST NIRSpec G395H
Mikal-Evans, Thomas; Stevenson, Kevin B.; Kirk, James +29 more
Carbon monoxide (CO) is predicted to be the dominant carbon-bearing molecule in giant planet atmospheres and, along with water, is important for discerning the oxygen and therefore carbon-to-oxygen ratio of these planets. The fundamental absorption mode of CO has a broad, double-branched structure composed of many individual absorption lines from …
The Imprint of Clump Formation at High Redshift. II. The Chemistry of the Bulge
Fisher, Deanne B.; Nidever, David L.; Valenti, Elena +11 more
In Paper I, we showed that clumps in high-redshift galaxies, having a high star formation rate density (ΣSFR), produce disks with two tracks in the [Fe/H]-[α/Fe] chemical space, similar to that of the Milky Way's (MW's) thin+thick disks. Here we investigate the effect of clumps on the bulge's chemistry. The chemistry of the MW's bulge i…
A Southern Photometric Quasar Catalog from the Dark Energy Survey Data Release 2
Shen, Yue; Yang, Qian
We present a catalog of 1.4 million photometrically selected quasar candidates in the southern hemisphere over the ~5000 deg2 Dark Energy Survey (DES) wide survey area. We combine optical photometry from the DES second data release (DR2) with available near-infrared (NIR) and the all-sky unWISE mid-infrared photometry in the selection. …
The Stellar Mass-Black Hole Mass Relation at z 2 down to {{M }}_{\mathrm{BH}}∼ {10}(7} {M) _{⊙ } Determined by HETDEX
Ono, Yoshiaki; Ouchi, Masami; Finkelstein, Steven L. +14 more
We investigate the stellar mass-black hole mass ( ${{ \mathcal M }}_{* }\mbox{--}{{ \mathcal M }}_{\mathrm{BH}}$ ) relation with type 1 active galactic nuclei (AGNs) down to ${{ \mathcal M }}_{\mathrm{BH}}={10}^{7\,}{M}_{\odot }$ , corresponding to a ≃ -21 absolute magnitude in rest-frame ultraviolet, at z = 2-2.5. Exploiting the deep and large-ar…
ED-2: A cold but not so narrow stellar stream crossing the solar neighbourhood
Helmi, A.; Balbinot, E.; Ruiz-Lara, T. +3 more
Context. ED-2 is a stellar stream identified as a compact group in integrals-of-motion space in a local sample of halo stars from the third Gaia data release.
Aims: We investigate its nature and possible association with known halo substructures.
Methods: We explored the current properties of ED-2 members in phase-space and also analysed…
The ultraviolet habitable zone of exoplanets
Ghirlanda, G.; Ghisellini, G.; Borsa, F. +2 more
The dozens of rocky exoplanets discovered in the circumstellar habitable zone (CHZ) currently represent the most suitable places to host life as we know it outside the Solar system. However, the presumed presence of liquid water on the CHZ planets does not guarantee suitable environments for the emergence of life. According to experimental studies…
SN 2022acko: The First Early Far-ultraviolet Spectra of a Type IIP Supernova
Van Dyk, Schuyler D.; Smith, Nathan; Hillier, D. John +41 more
We present five far- and near-ultraviolet spectra of the Type II plateau supernova, SN 2022acko, obtained 5, 6, 7, 19, and 21 days after explosion, all observed with the Hubble Space Telescope/Space Telescope Imaging Spectrograph. The first three epochs are earlier than any Type II plateau supernova has been observed in the far-ultraviolet reveali…
The multiwavelength view of shocks in the fastest nova V1674 Her
Mukai, K.; Sokoloski, J. L.; Buson, S. +41 more
Classical novae are shock-powered multiwavelength transients triggered by a thermonuclear runaway on an accreting white dwarf. V1674 Her is the fastest nova ever recorded (time to declined by two magnitudes is t2 = 1.1 d) that challenges our understanding of shock formation in novae. We investigate the physical mechanisms behind nova em…