Search Publications
The effects of dwarf galaxies on the orbital evolution of galactic globular clusters
Bovy, Jo; Webb, Jeremy J.; Garrow, Turner
We investigate the effect that dwarf galaxies have on the orbits, tidal histories, and assumed formation environment of Milky Way globular clusters. We determine the orbits of the Milky Way's 150 globular clusters in a gravitational potential both with and without dwarf galaxies. We find that the presence of a small number of satellite galaxies ca…
The stellar variability noise floor for transiting exoplanet photometry with PLATO
Hawley, Suzanne L.; Agol, Eric; Morris, Brett M. +2 more
One of the main science motivations for the ESA PLAnetary Transit and Oscillations (PLATO) mission is to measure exoplanet transit radii with 3 per cent precision. In addition to flares and starspots, stellar oscillations and granulation will enforce fundamental noise floors for transiting exoplanet radius measurements. We simulate light curves of…
Euclid preparation. VIII. The Complete Calibration of the Colour-Redshift Relation survey: VLT/KMOS observations and data release
Cimatti, A.; Ilbert, O.; Burigana, C. +145 more
The Complete Calibration of the Colour-Redshift Relation survey (C3R2) is a spectroscopic effort involving ESO and Keck facilities designed specifically to empirically calibrate the galaxy colour-redshift relation - P(z|C) to the Euclid depth (iAB = 24.5) and is intimately linked to the success of upcoming Stage IV dark energy missions …
A year-long plateau in the late-time near-infrared light curves of type Ia supernovae
Ryan, R.; Maguire, K.; Graur, O. +6 more
The light curves of type Ia supernovae are routinely used to constrain cosmology models. Driven by radioactive decay of 56Ni, the light curves steadily decline over time, but after 150 d post-explosion the near-infrared portion is poorly characterized. We report a year-long plateau in the near-infrared light curve at 150-500 d, followed…
An Analysis of the Shapes of Interstellar Extinction Curves. VIII. The Optical Extinction Structure
Gordon, Karl D.; Fitzpatrick, E. L.; Massa, Derck
New Hubble Space Telescope/STIS optical spectra were obtained for a sample of early-type stars with existing International Ultraviolet Explorer UV spectra. These data were used to construct optical extinction curves whose general properties are discussed elsewhere. In this paper, we identify extinction features in the curves that are wider than di…
On the Chemical and Kinematic Consistency between N-rich Metal-poor Field Stars and Enriched Populations in Globular Clusters
Shi, Jianrong; Fernández-Trincado, J. G.; Gao, Qi +5 more
Interesting chemically peculiar field stars may reflect their stellar evolution history and their possible origin in a different environment from where they are found now; this is one of the most important research fields in Galactic archeology. To explore this further, we have used the CN-CH bands around 4000 Å to identify N-rich metal-poor field…
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 …