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Transiting exocomets detected in broadband light by TESS in the β Pictoris system
Zwintz, K.; Kennedy, G. M.; Zieba, S. +1 more
Aims: We search for signs of falling evaporating bodies (FEBs, also known as exocomets) in photometric time series obtained for β Pictoris after fitting and removing its δ Scuti-type pulsation frequencies.
Methods: Using photometric data obtained by the TESS satellite we determined the pulsational properties of the exoplanet host star β …
Environmental impacts on molecular gas in protocluster galaxies at z ∼ 2
Tamura, Yoichi; Kohno, Kotaro; Suzuki, Tomoko L. +12 more
We present the results from ALMA CO(3-2) observations of 66 Hα-selected galaxies in three protoclusters around radio galaxies: PKS 1138-262 (z = 2.16), USS 1558-003 (z = 2.53), and 4C 23.56 (z = 2.49). The pointing areas have an overdensity of ∼100 compared to the mean surface number density of galaxies in field environments. We detect the CO emis…
The local and distant Universe: stellar ages and H0
Verde, Licia; Jimenez, Raul; Cimatti, Andrea +2 more
The ages of the oldest stellar objects in our galaxy provide an independent test of the current cosmological model as they give a lower limit to the age of the Universe. Recent accurate parallaxes by the Gaia space mission, accurate measurements of the metallicity of stars, via individual elemental abundances, and advances in the modelling of stel…
Standard Galactic field RR Lyrae II: a Gaia DR2 calibration of the period-Wesenheit-metallicity relation
Madore, Barry F.; Freedman, Wendy L.; Sarajedini, Ata +9 more
RR Lyrae stars have long been popular standard candles, but significant advances in methodology and technology have been made in recent years to increase their precision as distance indicators. We present multiwavelength (optical UBVRcIc and Gaia G, BP, RP; near-infrared JHKs; mid-infrared [3.6], [4.5]) period-lumi…
Solar Chromospheric Temperature Diagnostics: A Joint ALMA-Hα Analysis
Cranmer, Steven R.; Reardon, Kevin P.; Uitenbroek, Han +4 more
We present the first high-resolution, simultaneous observations of the solar chromosphere in the optical and millimeter wavelength ranges, obtained with the Atacama Large Millimeter Array (ALMA) and the Interferometric Bidimensional Spectrometer at the Dunn Solar Telescope. In this paper we concentrate on the comparison between the brightness temp…
Evident black hole-bulge coevolution in the distant universe
Alexander, D. M.; Brandt, W. N.; Yang, G. +4 more
Observations in the local universe show a tight correlation between the masses of supermassive black holes (SMBHs; MBH) and host-galaxy bulges (Mbulge), suggesting a strong connection between SMBH and bulge growth. However, direct evidence for such a connection in the distant universe remains elusive. We have studied sample-a…
Stokes inversion based on convolutional neural networks
Asensio Ramos, A.; Díaz Baso, C. J.
Context. Spectropolarimetric inversions are routinely used in the field of solar physics for the extraction of physical information from observations. The application to two-dimensional fields of view often requires the use of supercomputers with parallelized inversion codes. Even in this case, the computing time spent on the process is still very…
Reverberation Measurements of the Inner Radii of the Dust Tori in Quasars
Minezaki, Takeo; Yoshii, Yuzuru; Enya, Keigo +8 more
We present the results of a dust-reverberation survey of quasars at redshifts z < 0.6. We found a delayed response of the K-band flux variation after the optical flux variation in 25 out of 31 targets, and obtained the lag time between them for 22 targets. Combined with the results for nearby Seyfert galaxies, we provide the largest homogeneous…
Quasars as standard candles II. The non-linear relation between UV and X-ray emission at high redshifts
Vignali, C.; Lusso, E.; Salvestrini, F. +2 more
A tight non-linear relation between the X-ray and the optical-ultraviolet (UV) emission has been observed in active galactic nuclei (AGN) over a wide range of redshift and several orders of magnitude in luminosity, suggesting the existence of an ubiquitous physical mechanism regulating the energy transfer between the accretion disc and the X-ray e…
Binary asteroseismic modelling: isochrone-cloud methodology and application to Kepler gravity mode pulsators
Aerts, C.; Pápics, P. I.; Bowman, D. M. +5 more
The simultaneous presence of variability due to both pulsations and binarity is no rare phenomenon. Unfortunately, the complexities of dealing with even one of these sources of variability individually means that the other signal is often treated as a nuisance and discarded. However, both types of variability offer means to probe fundamental stell…