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Detecting Solar System Analogs through Joint Radial Velocity/Astrometric Surveys
Angus, Ruth; Foreman-Mackey, Daniel; Spergel, David N. +1 more
Earth-mass exoplanets on year-long orbits and cool gas giants (CGG) on decade-long orbits lie at the edge of current detection limits. The Terra Hunting Experiment (THE) will take nightly radial velocity (RV) observations on HARPS3 of at least 40 bright nearby G and K dwarfs for 10 yr, with a target 1σ measurement error of ~0.3 m s-1, i…
Small-scale EUV features as the drivers of coronal upflows in the quiet Sun
Teriaca, Luca; Long, David M.; Schühle, Udo +18 more
Context. Coronal upflows in the quiet Sun are seen in a wide range of features, including jets and filament eruptions. The in situ measurements from Parker Solar Probe within ≈0.2 au have demonstrated that the solar wind is highly structured, showing abrupt and near-ubiquitous magnetic field reversals (i.e., switchbacks) on different timescales. T…
Stellar-reddening-based Extinction Maps for Cosmological Applications
Finkbeiner, Douglas P.; Mudur, Nayantara; Park, Core Francisco
Cosmological surveys must correct their observations for the reddening of extragalactic objects by Galactic dust. Existing dust maps, however, have been found to have spatial correlations with the large-scale structure of the Universe. Errors in extinction maps can propagate systematic biases into samples of dereddened extragalactic objects and in…
To grow old and peculiar: Survey of anomalous variable stars in M80 with age determinations using K2 and Gaia
Pál, András; Kinemuchi, Karen; Kollmeier, Juna A. +11 more
The globular cluster Messier 80 was monitored by the Kepler space telescope for 80 days during the K2 mission. Continuous, high-precision photometry of such an old, compact cluster allows us for studies of its variable star population in unprecedented detail. We used differential-image photometry to extract light curves for 27 variable stars A sea…
The Large Deficit of HMXB Emission from Luminous Infrared Galaxies: The Case of the Circumnuclear Starburst Ring in NGC 7552
Zezas, Andreas; Roberts, Timothy P.; West, Lacey +5 more
Luminous infrared galaxies (LIRGs), the most extreme star-forming galaxies in the nearby (D < 30 Mpc) universe, show a notable X-ray emission deficiency (up to a factor of ~10) compared with predictions from scaling relations of galaxy-wide high-mass X-ray binary (HMXB) luminosity with star formation rate. In the nearby (≈20 Mpc) LIRG NGC 7552,…
NGTS clusters survey - V. Rotation in the Orion star-forming complex
Ramsay, Gavin; Wheatley, Peter J.; Moyano, Maximiliano +16 more
We present a study of rotation across 30 square degrees of the Orion Star-forming Complex, following a ~200 d photometric monitoring campaign by the Next Generation Transit Survey (NGTS). From 5749 light curves of Orion members, we report periodic signatures for 2268 objects and analyse rotation period distributions as a function of colour for 178…
Asteroseismic modelling strategies in the PLATO era. I. Mean density inversions and direct treatment of the seismic information
Bétrisey, J.; Buldgen, G.; Reese, D. R. +6 more
Context. Asteroseismology experienced a breakthrough in the last two decades thanks to the so-called photometry revolution with space-based missions such as CoRoT, Kepler, and TESS. Because asteroseismic modelling will be part of the pipeline of the future PLATO mission, it is relevant to compare some of the current modelling strategies and discus…
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…