Search Publications
Characterizing K2 Candidate Planetary Systems Orbiting Low-mass Stars. IV. Updated Properties for 86 Cool Dwarfs Observed during Campaigns 1-17
Vanderburg, Andrew; Schlieder, Joshua E.; Crepp, Justin R. +15 more
We present revised stellar properties for 172 K2 target stars that were identified as possible hosts of transiting planets during Campaigns 1-17. Using medium-resolution near-infrared spectra acquired with the NASA Infrared Telescope Facility/SpeX and Palomar/TripleSpec, we found that 86 of our targets were bona fide cool dwarfs, 74 were hotter dw…
Latitudinal variation in the abundance of methane (CH4) above the clouds in Neptune's atmosphere from VLT/MUSE Narrow Field Mode Observations
Bacon, Roland; Fletcher, Leigh N.; Irwin, Patrick G. J. +5 more
Observations of Neptune, made in 2018 using the new Narrow Field Adaptive Optics mode of the Multi Unit Spectroscopic Explorer (MUSE) instrument at the Very Large Telescope (VLT) from 0.48 to 0.93 µm, are analysed here to determine the latitudinal and vertical distribution of cloud opacity and methane abundance in Neptune's observable tropos…
Spatial distribution of stellar mass and star formation activity at 0.2 < z < 1.2 across and along the main sequence
Popesso, P.; Oesch, P. A.; Illingworth, G. D. +5 more
High-resolution multi-wavelength photometry is crucial to explore the spatial distribution of star formation in galaxies and understand how these evolve. To this aim, in this paper we exploit the deep, multi-wavelength Hubble Space Telescope (HST) data available in the central parts of the Great Observatories Origins Deep Survey (GOODS) fields and…
Extreme starlight polarization in a region with highly polarized dust emission
Tassis, Konstantinos; Hensley, Brandon S.; Blinov, Dmitry +2 more
Context. Galactic dust emission is polarized at unexpectedly high levels, as revealed by Planck.
Aims: The origin of the observed ≃20% polarization fractions can be identified by characterizing the properties of optical starlight polarization in a region with maximally polarized dust emission.
Methods: We measure the R-band linear polari…
Filling in the Quasar Redshift Gap at z ∼ 5.5. II. A Complete Survey of Luminous Quasars in the Post-reionization Universe
Fan, Xiaohui; Jiang, Linhua; McGreer, Ian D. +10 more
We present the final results from our survey of luminous z ∼ 5.5 quasars. This is the first systematic quasar survey focusing on quasars at z ∼ 5.5, during the post-reionization epoch. It has been challenging to select quasars at 5.3 < z < 5.7 using conventional color selections, due to their similar optical colors to those of late-type star…
The solar wind in time - II. 3D stellar wind structure and radio emission
Petit, P.; Vidotto, A. A.; Jeffers, S. V. +6 more
In this work, we simulate the evolution of the solar wind along its main-sequence lifetime and compute its thermal radio emission. To study the evolution of the solar wind, we use a sample of solar mass stars at different ages. All these stars have observationally reconstructed magnetic maps, which are incorporated in our 3D magnetohydrodynamic si…
Mass discrepancy analysis for a select sample of Type II-Plateau supernovae
Bersten, Melina C.; Martinez, Laureano
The detailed study of supernovae (SNe) and their progenitors allows a better understanding of the evolution of massive stars and how these end their lives. Despite its importance, the range of physical parameters for the most common type of explosion, the type II supernovae (SNe II), is still unknown. In particular, previous studies of type II-Pla…
Spitzer Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-rotating Low-mass Brown Dwarf
Helling, Christiane; Maoz, Dan; Tan, Thiam-Guan +69 more
The kinematics of isolated brown dwarfs in the Galaxy, beyond the solar neighborhood, is virtually unknown. Microlensing has the potential to probe this hidden population, as it can measure both the mass and five of the six phase-space coordinates (all except the radial velocity) even of a dark isolated lens. However, the measurements of both the …
Spectroscopy and Differential Emission Measure Diagnostics of a Coronal Dimming Associated with a Fast Halo CME
Veronig, Astrid M.; Temmer, Manuela; Dissauer, Karin +2 more
We study the coronal dimming caused by the fast halo CME (deprojected speed v = 1250 km s-1) associated with the C3.7 two-ribbon flare on 2012 September 27, using Hinode/EIS spectroscopy and Solar Dynamics Observatory (SDO)/AIA Differential Emission Measure (DEM) analysis. The event reveals bipolar core dimmings encompassed by hook-shap…
Revealing the Complicated Story of the Cetus Stream with StarGO
Chang, Jiang; Smith, M. C.; Liu, Chao +5 more
We use a novel cluster identification tool, STARGO, to explore the metal-poor ([Fe/H] < -1.5) outer stellar halo (d > 15 kpc) of the Milky Way using data from Gaia, LAMOST, and SDSS. Our method is built using an unsupervised learning algorithm, a self-organizing map, which trains a 2D neural network to learn the topological structures of a d…