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Mode identification in three pulsating hot subdwarfs observed with TESS satellite
Heber, U.; Irrgang, A.; Raddi, R. +12 more
We report on the detection of pulsations of three pulsating subdwarf B stars observed by the Transiting Exoplanet Survey Satellite (TESS) satellite and our results of mode identification in these stars based on an asymptotic period relation. SB 459 (TIC 067584818), SB 815 (TIC 169285097), and PG 0342 + 026 (TIC 457168745) have been monitored durin…
Aram Dorsum: An Extensive Mid-Noachian Age Fluvial Depositional System in Arabia Terra, Mars
Sefton-Nash, Elliot; Williams, Rebecca M. E.; Fawdon, Peter +5 more
A major debate in Mars science is the nature of the early Mars climate, and the availability of precipitation and runoff. Observations of relict erosional valley networks have been proposed as evidence for extensive surface runoff around the Noachian-Hesperian boundary. However, these valley networks only provide a time-integrated record of landsc…
Increasing Activity in T CrB Suggests Nova Eruption Is Impending
Sokoloski, J. L.; Mukai, Koji; Luna, Gerardo J. M. +1 more
Estimates of the accretion rate in symbiotic recurrent novae (RNe) often fall short of theoretical expectations by orders of magnitude. This apparent discrepancy can be resolved if the accumulation of mass by the white dwarf (WD) is highly sporadic, and most observations are performed during low states. Here we use a re-analysis of archival data f…
Calibrating Mg II-based Black Hole Mass Estimators Using Low-to-high-luminosity Active Galactic Nuclei
Xue, Yongquan; Woo, Jong-Hak; Le, Huynh Anh N.
We present single-epoch black hole mass (MBH) estimators based on the rest-frame ultraviolet (UV) Mg II 2798 Å and optical Hβ 4861 Å emission lines. To enlarge the luminosity range of active galactic nuclei (AGNs), we combine the 31 reverberation-mapped AGNs with relatively low luminosities from Bahk et al., 47 moderate-luminosity AGNs …
A Rotation Rate for the Planetary-mass Companion DH Tau b
Knutson, Heather A.; Morley, Caroline V.; Bowler, Brendan P. +3 more
DH Tau b is a young planetary-mass companion orbiting at a projected separation of 320 au from its ∼2 Myr old host star DH Tau. With an estimated mass of 8-22 ${M}_{\mathrm{Jup}}$ this object straddles the deuterium-burning limit, and might have formed via core or pebble accretion, disk instability, or molecular cloud fragmentation. To shed light …
The Carnegie Supernova Project II. Observations of the intermediate-luminosity red transient SNhunt120
Suntzeff, N. B.; Galbany, L.; Baron, E. +23 more
We present multiwavelength observations of two gap transients that were followed by the Carnegie Supernova Project-II. The observations are supplemented with data obtained by a number of different programs. Here in the first of two papers, we focus on the intermediate-luminosity red transient (ILRT) designated SNhunt120, while in a companion paper…
Analysis of Large Deflections of Prominence-CME Events during the Rising Phase of Solar Cycle 24
Stenborg, Guillermo; West, Matthew J.; Mierla, Marilena +7 more
The analysis of the deflection of coronal mass ejection (CME) events plays an important role in the improvement of the forecasting of their geo-effectiveness. Motivated by the scarcity of comprehensive studies of CME events with a focus on the governing conditions that drive deflections during their early stages, we performed an extensive analysis…
Discovery of Magellanic Stellar Debris in the H3 Survey
Conroy, Charlie; Ting, Yuan-Sen; Cargile, Phillip A. +9 more
We report the discovery of 15 stars in the H3 survey that lie, in projection, near the tip of the trailing gaseous Magellanic Stream (MS). The stars have Galactocentric velocities <-155 km s-1, Galactocentric distances of ≈40 to 80 kpc (increasing along the MS), and [Fe/H] consistent with that of stars in the Small Magellanic Cloud. …
Binary evolution along the red giant branch with BINSTAR: The barium star perspective
Jorissen, A.; Escorza, A.; Van Winckel, H. +1 more
Barium (Ba), CH, and extrinsic or Tc-poor S-type stars are evolved low- and intermediate-mass stars that show enhancement of slow-neutron-capture-process elements on their surface, an indication of mass accretion from a former asymptotic giant branch companion, which is now a white dwarf (WD). Ba and CH stars can be found in the main-sequence (MS)…
Luminous Lyα Emitters with Very Blue UV-continuum Slopes at Redshift 5.7 ≤ z ≤ 6.6
Jiang, Linhua; Schaerer, Daniel; Egami, Eiichi +4 more
We study six luminous Lyα emitters (LAEs) with very blue rest-frame UV continua at 5.7 ≤ z ≤ 6.6. These LAEs have previous Hubble Space Telescope (HST) and Spitzer IRAC observations. Combining our newly acquired HST images, we find that their UV-continuum slopes β are in a range of -3.4 ≤ β ≤ -2.6. Unlike previous, tentative detections of β ≃ -3 i…