Search Publications
Revisiting BD-06 1339b: A Likely False Positive Caused by Stellar Activity
Kane, Stephen R.; Pepper, Joshua; Fetherolf, Tara +3 more
As long as astronomers have searched for exoplanets, the intrinsic variability of host stars has interfered with the ability to reliably detect and confirm exoplanets. One particular source of false positives is the presence of stellar magnetic or chromospheric activity that can mimic the radial velocity reflex motion of a planet. Here we present …
The interstellar medium of high-redshift galaxies: Gathering clues from C III] and [C II] lines
Maiolino, R.; Pentericci, L.; Ferrara, A. +5 more
Context. A tight relation between [C II] 158 µm line luminosity and the star formation rate (SFR) has been observed for local galaxies. At high redshift (z > 5), galaxies instead deviate downwards from the local Σ[C II] − ΣSFR relation. This deviation might be caused by different interstellar medium (ISM) properties …
Energetic proton back-precipitation onto the solar atmosphere in relation to long-duration gamma-ray flares
Laitinen, T.; Dalla, S.; de Nolfo, G. A. +4 more
Context. Gamma-ray emission during long-duration gamma-ray flare (LDGRF) events is thought to be caused mainly by > 300 MeV protons interacting with the ambient plasma at or near the photosphere. Prolonged periods of the gamma-ray emission have prompted the suggestion that the source of the energetic protons is acceleration at a coronal mass ej…
A dense 0.1-solar-mass star in a 51-minute-orbital-period eclipsing binary
Kulkarni, S. R.; Riddle, Reed; Dhillon, V. S. +24 more
Of more than a thousand known cataclysmic variables (CVs), where a white dwarf is accreting from a hydrogen-rich star, only a dozen have orbital periods below 75 minutes1-9. One way to achieve these short periods requires the donor star to have undergone substantial nuclear evolution before interacting with the white dwarf10-14
Hubble Space Telescope Imaging of Isolated Local Volume Dwarfs GALFA Dw3 and Dw4
Crnojević, D.; Mutlu-Pakdil, B.; Sand, D. J. +16 more
We present observations of the dwarf galaxies GALFA Dw3 and GALFA Dw4 with the Advanced Camera for Surveys on the Hubble Space Telescope. These galaxies were initially discovered as optical counterparts to compact H I clouds in the GALFA survey. Both objects resolve into stellar populations which display old red giant branch (RGB), younger helium-…
A Census of 163 Large-scale (≥10 pc), Velocity-coherent Filaments in the Inner Galactic Plane: Physical Properties, Dense-gas Fraction, and Association with Spiral Arms
Wang, Ke; Ge, Yifei
The interstellar medium has a highly filamentary and hierarchical structure that may play a significant role in star formation. A systematical study of the large-scale filaments toward their physical parameters, distribution, structures, and kinematics will inform us about which types of filaments have the potential to form stars, how the material…
Sensitivity of future gamma-ray telescopes to primordial black holes
Linden, Tim; Hooper, Dan; Keith, Celeste +1 more
The strongest existing constraints on primordial black holes with masses in the range of mBH∼1015- 1017 g have been derived from measurements of the local cosmic-ray electron-positron flux by Voyager 1, and MeV-scale gamma-ray observations of the inner Galaxy by COMPTEL and INTEGRAL. In this paper, we evaluate the …
Probing Kepler's hottest small planets via homogeneous search and analysis of optical secondary eclipses and phase variations
Scandariato, G.; Pagano, I.; Fossati, L. +5 more
Context. High-precision photometry can lead to the detection of secondary eclipses and phase variations of highly irradiated planets.
Aims: We performed a homogeneous search and analysis of optical occultations and phase variations of the most favorable ultra-short-period (USP) (P < 1 days) sub-Neptunes (Rp < 4 R⊕)…
Thermal Structure and Aerosols in Mars' Atmosphere From TIRVIM/ACS Onboard the ExoMars Trace Gas Orbiter: Validation of the Retrieval Algorithm
Grigoriev, A.; Forget, F.; Montmessin, F. +12 more
The Atmospheric Chemistry Suite (ACS) onboard the ExoMars Trace Gas Orbiter monitors the Martian atmosphere through different spectral intervals in the infrared light. We present a retrieval algorithm tailored to the analysis of spectra acquired in nadir geometry by Thermal InfraRed channel in honor of professor Vassilii Ivanovich Moroz (TIRVIM), …
Open clusters housing classical Cepheids in Gaia DR3
Hao, C. J.; Xu, Y.; Lin, Z. H. +4 more
The latest Gaia Data Release 3 provides an opportunity to expand the census of Galactic open clusters harboring classical Cepheid variables, thereby bolstering the cosmic distance scale. A comprehensive analysis yielded a total of 50 classical Cepheids associated with 45 open clusters, of which 39 open cluster-classical Cepheid pairs are considere…