Search Publications
Intriguing Plasma Composition Pattern in a Solar Active Region: A Result of Nonresonant Alfvén Waves?
Stangalini, Marco; Long, David M.; Brooks, David H. +6 more
The plasma composition of the solar corona is different from that of the solar photosphere. Elements that have a low first ionization potential (FIP) are preferentially transported to the corona and therefore show enhanced abundances in the corona compared to the photosphere. The level of enhancement is measured using the FIP bias parameter. In th…
How Magnetic Reconnection May Affect the Coherence of Interplanetary Coronal Mass Ejections
Farrugia, C. J.; Galvin, A. B.; Davies, E. E. +12 more
On 2020 April 19-20, a solar ejection was seen by spacecraft in a radial alignment that included Solar Orbiter and Wind. The ejection contained a magnetic flux rope where magnetic field and plasma parameters were well correlated between spacecraft. This structure is called an "unperturbed magnetic flux rope" (UMFR). Ahead of the UMFR is a portion …
Internal Calibration of LAMOST and Gaia DR3 GSP-Spec Stellar Abundances
Niu, Zexi; Liu, Jifeng; Yuan, Haibo
Stellar chemical abundances are crucial and fundamental in astrophysics. However, they could suffer from substantial systematic errors according to several investigations but still lack calibrations in bulk. By using Gaia wide binaries, we find the temperature-dependent bias between the two binary components for [Fe/H] and [α/Fe] measurements from…
Kpc-scale properties of dust temperature in terms of dust mass and star formation activity
Sandstrom, Karin M.; Leroy, Adam K.; Rosolowsky, Erik +7 more
We investigate how dust temperature is affected by local environmental quantities, especially dust surface density (Σdust), dust-to-gas ratio (D/G), and interstellar radiation field. We compile multiwavelength observations in 46 nearby galaxies, uniformly processed with a common physical resolution of 2 kpc. A physical dust model is use…
SOFIA FEEDBACK Survey: The Pillars of Creation in [C II] and Molecular Lines
Wyrowski, Friedrich; Tiwari, Maitraiyee; Güsten, Rolf +11 more
We investigate the physical structure and conditions of photodissociation regions (PDRs) and molecular gas within the Pillars of Creation in the Eagle Nebula using SOFIA FEEDBACK observations of the [C II] 158 µm line. These observations are velocity resolved to 0.5 km s-1 and are analyzed alongside a collection of complimentary d…
The Binary and the Disk: The Beauty is Found within NGC3132 with JWST
Sahai, Raghvendra; Bujarrabal, Valentin; Quintana-Lacaci, Guillermo +4 more
The planetary nebula (PN) NGC 3132 is a striking example of the dramatic but poorly understood mass-loss phenomena that (1-8) M ⊙ stars undergo during their death throes as they evolve into white dwarfs (WDs). From an analysis of JWST multiwavelength (0.9-18 µm) imaging of NGC 3132, we report the discovery of an extended dust clou…
Novae in M51: a new, much higher rate from multi-epoch HST data
van Dokkum, Pieter; Conroy, Charlie; Shara, Michael M. +2 more
Accurate determination of the rates of nova eruptions in different kinds of galaxies gives us strong constraints on those galaxies' underlying white dwarf and binary populations, and those stars' spatial distributions. Until 2016, limitations inherent in ground-based surveys of external galaxies - and dust extinction in the Milky Way - significant…
The Direction of the Flow of Interstellar Neutral H Based on Photometric Observations from SOHO/SWAN
Bzowski, M.; Quémerais, E.; Kubiak, M. A. +3 more
Interstellar neutral hydrogen flows into the heliosphere as a mixture of the primary and secondary populations from two somewhat different directions due to splitting occurring in the magnetized outer heliosheath. The direction of the inflow of interstellar neutral H observed in the inner heliosphere, confronted with that of the unperturbed flow o…
HST/WFC3 Light Curve Supports a Terrestrial Composition for the Closest Exoplanet to Transit an M Dwarf
Winters, Jennifer G.; Eastman, Jason D.; Bean, Jacob L. +6 more
Previous studies of the exoplanet LTT 1445Ac concluded that the light curve from the Transiting Exoplanet Survey Satellite (TESS) was consistent with both grazing and nongrazing geometries. As a result, the radius and hence density of the planet remained unknown. To resolve this ambiguity, we observed the LTT 1445 system for six spacecraft orbits …
Searching for ejected supernova companions in the era of precise proper motion and radial velocity measurements
Lyman, J. D.; Groot, P. J.; Wiersema, K. +7 more
The majority of massive stars are born in binaries, and most unbind upon the first supernova. With precise proper motion surveys such as Gaia, it is possible to trace back the motion of stars in the vicinity of young remnants to search for ejected companions. Establishing the fraction of remnants with an ejected companion, and the photometric and …