Search Publications
Planet Occurrence Rate Correlated to Stellar Dynamical History: Evidence from Kepler and Gaia
Zhou, Ji-Lin; Dai, Yuan-Zhe; Liu, Hui-Gen +1 more
The dynamical history of stars influences the formation and evolution of planets significantly. To explore the influence of dynamical history on the planet formation and evolution using observations, we assume stars that experienced significantly different dynamical histories tend to have different relative velocities. Utilizing the accurate Gaia-…
Whistler instability driven by the sunward electron deficit in the solar wind. High-cadence Solar Orbiter observations
Lewis, G. R.; Kataria, D. O.; Livi, S. +19 more
Context. Solar wind electrons play an important role in the energy balance of the solar wind acceleration by carrying energy into interplanetary space in the form of electron heat flux. The heat flux is stored in the complex electron velocity distribution functions (VDFs) shaped by expansion, Coulomb collisions, and field-particle interactions.
A proto-pseudobulge in ESO 320-G030 fed by a massive molecular inflow driven by a nuclear bar
Smith, Howard A.; Colina, Luis; Alonso-Herrero, Almudena +10 more
Galaxies with nuclear bars are believed to efficiently drive gas inward, generating a nuclear starburst and possibly an active galactic nucleus. We confirm this scenario for the isolated, double-barred, luminous infrared galaxy ESO 320-G030 based on an analysis of Herschel and ALMA spectroscopic observations. Herschel/PACS and SPIRE observations o…
NICER Discovery of Millisecond X-Ray Pulsations and an Ultracompact Orbit in IGR J17494-3030
Chakrabarty, Deepto; Ray, Paul S.; Wolff, Michael T. +11 more
We report the detection of 376.05 Hz (2.66 ms) coherent X-ray pulsations in NICER observations of a transient outburst of the low-mass X-ray binary IGR J17494-3030 in 2020 October/November. The system is an accreting millisecond X-ray pulsar in a 75-minute ultracompact binary. The mass donor is most likely a ≃0.02 M⊙ finite-entropy whit…
CLUMP-3D: the lack of non-thermal motions in galaxy cluster cores
Cui, Weiguang; Umetsu, Keiichi; Sereno, Mauro +5 more
We report the non-thermal pressure fraction (Pnt/Ptot) obtained from a three-dimensional triaxial analysis of 16 galaxy clusters in the CLASH sample using gravitational lensing (GL) data primarily from Subaru and HST, X-ray spectroscopic imaging from Chandra, and Sunyaev-Zel'dovich effect (SZE) data from Planck and Bolocam. O…
Exploring HNC and HCN line emission as probes of the protoplanetary disk temperature
Bosman, Arthur D.; Guzmán, Viviana V.; Long, Feng +6 more
Context. The distributions and abundances of molecules in protoplanetary disks are powerful tracers of the physical and chemical disk structures. The abundance ratios of HCN and its isomer HNC are known to be sensitive to gas temperature. Their line ratios might therefore offer a unique opportunity to probe the properties of the emitting gas.
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The post-Herschel view of intrinsic AGN emission: constructing templates for galaxy and AGN emission at IR wavelengths
Alexander, D. M.; Mullaney, J. R.; Rosario, D. J. +3 more
Measuring the star-forming properties of active galactic nucleus (AGN) hosts is key to our understanding of galaxy formation and evolution. However, this topic remains debated, partly due to the difficulties in separating the infrared (i.e. 1-1000 ${\rm \mu m}$) emission into AGN and star-forming components. Taking advantage of archival far-infrar…
Testing the fossil field hypothesis: could strongly magnetized OB stars produce all known magnetars?
Igoshev, Andrei P.; Kholtygin, A. F.; Makarenko, Ekaterina I.
Stars of spectral types O and B produce neutron stars (NSs) after supernova explosions. Most of NSs are strongly magnetized including normal radio pulsars with B ∝ 1012 G and magnetars with B ∝ 1014 G. A fraction of 7-12 per cent of massive stars are also magnetized with B ∝ 103 G and some are weakly magnetized wit…
The Remarkable Spin-down and Ultrafast Outflows of the Highly Pulsed Supersoft Source of Nova Herculis 2021
Luna, G. J. M.; Singh, K. P.; Drake, Jeremy J. +12 more
Nova Her 2021 (V1674 Her), which erupted on 2021 June 12, reached naked-eye brightness and has been detected from radio to γ-rays. An extremely fast optical decline of 2 magnitudes in 1.2 days and strong Ne lines imply a high-mass white dwarf. The optical pre-outburst detection of a 501.42 s oscillation suggests a magnetic white dwarf. This is the…
A Large Population of Luminous Active Galactic Nuclei Lacking X-Ray Detections: Evidence for Heavy Obscuration?
Stern, Daniel; Hickox, Ryan C.; Assef, Roberto J. +5 more
We present a large sample of infrared-luminous candidate active galactic nuclei (AGNs) that lack X-ray detections in Chandra, XMM-Newton, and NuSTAR fields. We selected all optically detected SDSS sources with redshift measurements, combined additional broadband photometry from WISE, UKIDSS, 2MASS, and GALEX, and modeled the spectral energy distri…