Dr Simone Scaringi's Outputs (91)

Discovery of persistent quasi-periodic oscillations in accreting white dwarfs: a new link to X-ray binaries (2024)
Journal Article
Veresvarska, M., Scaringi, S., Knigge, C., Paice, J., Buckley, D. A. H., Segura, N. C., de Martino, D., Groot, P. J., Ingram, A., Irving, Z. A., & Szkody, P. (2024). Discovery of persistent quasi-periodic oscillations in accreting white dwarfs: a new link to X-ray binaries. Monthly Notices of the Royal Astronomical Society, 534(4), 3087-3103. https://doi.org/10.1093/mnras/stae2279

Almost all accreting black hole and neutron star (NS) X-ray binary systems (XRBs) exhibit prominent brightness variations on a few characteristic time-scales and their harmonics. These quasi-periodic oscillations (QPOs) are thought to be associated w... Read More about Discovery of persistent quasi-periodic oscillations in accreting white dwarfs: a new link to X-ray binaries.

Unveiling the nature of two dwarf novae: CRTS J080846.2+313106 and V416 Dra (2024)
Journal Article
Joshi, A., Catelan, M., Scaringi, S., Schwope, A., Anupama, G. C., Rawat, N., Sahu, D. K., Singh, M., Dastidar, R., Subramanian, R. V., & Rao, S. M. (2024). Unveiling the nature of two dwarf novae: CRTS J080846.2+313106 and V416 Dra. Astronomy & Astrophysics, 689, Article A158. https://doi.org/10.1051/0004-6361/202348307

We present the analysis of optical photometric and spectroscopic observations of two non-magnetic cataclysmic variables, namely CRTS J080846.2+313106 and V416 Dra. We find CRTS J080846.2+313106 to vary with a period of 4.9116 ± 0.0003 h, which was no... Read More about Unveiling the nature of two dwarf novae: CRTS J080846.2+313106 and V416 Dra.

Ancient Nova Shells of RX Pup Indicate Evolution of Mass Transfer Rate (2024)
Journal Article
Iłkiewicz, K., Mikołajewska, J., Shara, M. M., Faherty, J. K., & Scaringi, S. (2024). Ancient Nova Shells of RX Pup Indicate Evolution of Mass Transfer Rate. Astrophysical Journal Letters, 972(1), Article L14. https://doi.org/10.3847/2041-8213/ad6e5a

RX Pup is a symbiotic binary that experienced a nova outburst in the 1970s. Here we report a discovery of a ∼1300 yr old nova shell around the system and a possible detection of a ∼7000 yr old nova shell. Together with the nova shell ejected in the 1... Read More about Ancient Nova Shells of RX Pup Indicate Evolution of Mass Transfer Rate.

Following the Pulsations in the Long-term Cooling of GW Librae and V386 Serpentis (2024)
Journal Article
Szkody, P., van Roestel, J., Bell, K. J., Vanderbosch, Z. P., Mukadam, A., & Scaringi, S. (2024). Following the Pulsations in the Long-term Cooling of GW Librae and V386 Serpentis. Astronomical Journal, 168(3), Article 114. https://doi.org/10.3847/1538-3881/ad656f

GW Lib and V386 Ser are dwarf novae systems containing pulsating white dwarfs that underwent large 8–9 mag amplitude outbursts in 2007 and 2019, respectively. Following the pulsation periods in these systems after the outburst provides a means to vie... Read More about Following the Pulsations in the Long-term Cooling of GW Librae and V386 Serpentis.

Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8−501810) as an intermediate polar (2024)
Journal Article
Potter, S. B., Buckley, D. A. H., Scaringi, S., Monageng, I. M., Egbo, O. D., Charles, P. A., …Hlakola, M. (2024). Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8−501810) as an intermediate polar. Monthly Notices of the Royal Astronomical Society: Letters, 532(1), L21-L26. https://doi.org/10.1093/mnrasl/slae038

We report on optical follow-up observations of an X-ray source initially detected by the Einstein Probe mission. Our investigations categorize the source as an intermediate polar, a class of magnetic cataclysmic variables, exhibiting an orbital perio... Read More about Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8−501810) as an intermediate polar.

Burst-induced spin variations in the accreting magnetic white dwarf PBC J0801.2–4625 (2024)
Journal Article
Irving, Z. A., Altamirano, D., Scaringi, S., Veresvarska, M., Knigge, C., Castro Segura, N., …Iłkiewicz, K. (2024). Burst-induced spin variations in the accreting magnetic white dwarf PBC J0801.2–4625. Monthly Notices of the Royal Astronomical Society, 530(4), 3974-3985. https://doi.org/10.1093/mnras/stae1103

PBC J0801.2–4625 is an intermediate polar with a primary spin frequency of 66.08 d−1 and an unknown orbital period. The long-term All Sky Automated Survey for Supernovae (ASAS-SN) light curve of this system reveals four bursts, all of which have simi... Read More about Burst-induced spin variations in the accreting magnetic white dwarf PBC J0801.2–4625.

TESS Photometry of AM Her and AR UMa: Binary Parameters, Cyclotron Emission Modeling, and Mass Transfer Duty Cycles (2024)
Journal Article
Mason, P. A., Hakala, P., Wu, K., Barrett, P. E., Iłkiewicz, K., Littlefield, C., …Scaringi, S. (2024). TESS Photometry of AM Her and AR UMa: Binary Parameters, Cyclotron Emission Modeling, and Mass Transfer Duty Cycles. Astrophysical Journal, 965(1), Article 96. https://doi.org/10.3847/1538-4357/ad27d7

Transiting Exoplanet Survey Satellite (TESS) photometry of the polars AM Herculis (AM Her) and AR Ursae Majoris (AR UMa) is presented, along with high-speed photometry. AM Her shows a variety of high states with frequent transitions between them. TES... Read More about TESS Photometry of AM Her and AR UMa: Binary Parameters, Cyclotron Emission Modeling, and Mass Transfer Duty Cycles.

Evolution of spin in the intermediate polar CC sculptoris (2024)
Journal Article
Paice, J. A., Scaringi, S., Castro Segura, N., Sahu, A., Iłkiewicz, K., Coppejans, D. L., …Veresvarska, M. (2024). Evolution of spin in the intermediate polar CC sculptoris. Monthly Notices of the Royal Astronomical Society: Letters, 531(1), L82-L86. https://doi.org/10.1093/mnrasl/slae035

We report on spin variations in the intermediate polar and cataclysmic variable CC Scl, as seen by the Transiting Exoplanet Survey Satellite (TESS). By studying both the spin period and its harmonic, we find that the spin has varied since it was firs... Read More about Evolution of spin in the intermediate polar CC sculptoris.

The Peculiar Bursting Nature of CP Pup (2024)
Journal Article
Veresvarska, M., Scaringi, S., Hagen, S., De Martino, D., Done, C., Ilkiewicz, K., …Littlefield, C. (2024). The Peculiar Bursting Nature of CP Pup. Monthly Notices of the Royal Astronomical Society, 529(1), 664-672. https://doi.org/10.1093/mnras/stae573

The classical nova CP Puppis has been observed to have particularly puzzling and peculiar properties. In particular, this classical nova displays occasional bursts in its long-term ASAS-SN light curve. Here, we report on five sectors of TESS data dis... Read More about The Peculiar Bursting Nature of CP Pup.

Classifying Optical (Out)bursts in Cataclysmic Variables: The Distinct Observational Characteristics of Dwarf Novae, Micronovae, Stellar Flares, and Magnetic Gating (2024)
Journal Article
Iłkiewicz, K., Scaringi, S., Veresvarska, M., De Martino, D., Littlefield, C., Knigge, C., …Sahu, A. (2024). Classifying Optical (Out)bursts in Cataclysmic Variables: The Distinct Observational Characteristics of Dwarf Novae, Micronovae, Stellar Flares, and Magnetic Gating. Astrophysical Journal Letters, 962(2), Article L34. https://doi.org/10.3847/2041-8213/ad243c

Cataclysmic variables can experience short optical brightenings, which are commonly attributed to phenomena such as dwarf novae outbursts, micronovae, donor flares, or magnetic gating bursts. Since these events exhibit similar observational character... Read More about Classifying Optical (Out)bursts in Cataclysmic Variables: The Distinct Observational Characteristics of Dwarf Novae, Micronovae, Stellar Flares, and Magnetic Gating.

MELCHIORS: The Mercator Library of High Resolution Stellar Spectroscopy (2024)
Journal Article
Royer, P., Merle, T., Dsilva, K., Sekaran, S., Van Winckel, H., Frémat, Y., …Waelkens, C. (2024). MELCHIORS: The Mercator Library of High Resolution Stellar Spectroscopy. Astronomy & Astrophysics, 681, Article A107. https://doi.org/10.1051/0004-6361/202346847

Aims. Over the past decades, libraries of stellar spectra have been used in a large variety of science cases, including as sources of reference spectra for a given object or a given spectral type. Despite the existence of large libraries and the incr... Read More about MELCHIORS: The Mercator Library of High Resolution Stellar Spectroscopy.

Digging a little deeper: characterizing three new extreme ULX candidates (2023)
Journal Article
Roberts, T. P., Walton, D. J., Mackenzie, A. D. A., Heida, M., & Scaringi, S. (2023). Digging a little deeper: characterizing three new extreme ULX candidates. Monthly Notices of the Royal Astronomical Society, 525(3), 3330-3343. https://doi.org/10.1093/mnras/stad2367

A prime motivation for compiling catalogues of any celestial X-ray source is to increase our numbers of rare subclasses. In this work, we take a recent multimission catalogue of ultraluminous X-ray sources (ULXs) and look for hitherto poorly-studied... Read More about Digging a little deeper: characterizing three new extreme ULX candidates.

Cataclysmic variables are a key population of gravitational wave sources for LISA (2023)
Journal Article
Scaringi, S., Breivik, K., Littenberg, T. B., Knigge, C., Groot, P. J., & Veresvarska, M. (2023). Cataclysmic variables are a key population of gravitational wave sources for LISA. Monthly Notices of the Royal Astronomical Society: Letters, 525(1), L50-L55. https://doi.org/10.1093/mnrasl/slad093

The gravitational wave (GW) signals from the Galactic population of cataclysmic variables (CVs) have yet to be carefully assessed. Here, we estimate these signals and evaluate their significance for Laser Interferometer Space Antenna (LISA). First, w... Read More about Cataclysmic variables are a key population of gravitational wave sources for LISA.

Unravelling optical and X-ray properties of the disc-dominated intermediate polar IGR J15094-6649 (2023)
Journal Article
Joshi, A., Rawat, N., Schwope, A., Pandey, J. C., Scaringi, S., Sahu, D. K., …Singh, M. (2023). Unravelling optical and X-ray properties of the disc-dominated intermediate polar IGR J15094-6649. Monthly Notices of the Royal Astronomical Society, 521(4), 6156-6169. https://doi.org/10.1093/mnras/stad933

SDSS J134441.83+204408.3: A Highly Asynchronous Short-period Magnetic Cataclysmic Variable with a 56 MG Field Strength (2023)
Journal Article
Littlefield, C., Mason, P. A., Garnavich, P., Szkody, P., Thorstensen, J., Scaringi, S., …Wells, N. (2023). SDSS J134441.83+204408.3: A Highly Asynchronous Short-period Magnetic Cataclysmic Variable with a 56 MG Field Strength. Astrophysical Journal Letters, 943(2), Article L24. https://doi.org/10.3847/2041-8213/acaf04

When the accreting white dwarf in a magnetic cataclysmic variable star (mCV) has a field strength in excess of 10 MG, it is expected to synchronize its rotational frequency to the binary orbit frequency, particularly at small binary separations, due... Read More about SDSS J134441.83+204408.3: A Highly Asynchronous Short-period Magnetic Cataclysmic Variable with a 56 MG Field Strength.

Kepler K2 and TESS Observations of Two Magnetic Cataclysmic Variables: The New Asynchronous Polar SDSS J084617.11+245344.1 and Paloma (2023)
Journal Article
Littlefield, C., Hoard, D., Garnavich, P., Szkody, P., Mason, P. A., Scaringi, S., Ilkiewicz, K., Kennedy, M. R., Rappaport, S. A., & Jayaraman, R. (2023). Kepler K2 and TESS Observations of Two Magnetic Cataclysmic Variables: The New Asynchronous Polar SDSS J084617.11+245344.1 and Paloma. Astronomical Journal, 165(2), Article 43. https://doi.org/10.3847/1538-3881/aca1a5

There have been relatively few published long-duration, uninterrupted light curves of magnetic cataclysmic variable stars in which the accreting white dwarf's rotational frequency is slightly desynchronized from the binary orbital frequency. We repor... Read More about Kepler K2 and TESS Observations of Two Magnetic Cataclysmic Variables: The New Asynchronous Polar SDSS J084617.11+245344.1 and Paloma.

SWIFT J0503.7-2819: A nearly synchronous intermediate polar below the period gap? (2022)
Journal Article
Rawat, N., Pandey, J., Joshi, A., Scaringi, S., & Yadava, U. (2022). SWIFT J0503.7-2819: A nearly synchronous intermediate polar below the period gap?. Monthly Notices of the Royal Astronomical Society, 517(2), 1667-1677. https://doi.org/10.1093/mnras/stac2723

Based on the X-ray observations from XMM-Newton and Swift, and optical observations from Transiting Exoplanet Survey Satellite (TESS) and AAVSO, we present temporal and spectral properties of probable intermediate polar SWIFT J0503.7-2819. The X-ray... Read More about SWIFT J0503.7-2819: A nearly synchronous intermediate polar below the period gap?.

Spectroscopic follow-up of a subset of the Gaia/IPHAS catalogue of Hα-excess sources (2022)
Journal Article
Fratta, M., Scaringi, S., Monguió, M., Pala, A., Drew, J., Knigge, C., Iłkiewicz, K., & Gandhi, P. (2022). Spectroscopic follow-up of a subset of the Gaia/IPHAS catalogue of Hα-excess sources. Monthly Notices of the Royal Astronomical Society, 518(3), 3301-3311. https://doi.org/10.1093/mnras/stac3216

State-of-the-art techniques to identify Hα emission-line sources in narrow-band photometric surveys consist of searching for  Hα excess with reference to nearby objects in the sky (position-based selection). However, while this approach usually yield... Read More about Spectroscopic follow-up of a subset of the Gaia/IPHAS catalogue of Hα-excess sources.

XGAPS: a sub-arcsec cross-match of galactic plane surveys (2022)
Journal Article
Scaringi, S., Monguió, M., Knigge, C., Fratta, M., Gänsicke, B., Groot, P., Rebassa-Mansergas, A., & Toloza, O. (2022). XGAPS: a sub-arcsec cross-match of galactic plane surveys. Monthly Notices of the Royal Astronomical Society, 518(2), 3137-3146. https://doi.org/10.1093/mnras/stac3353

We present a sub-arcsec cross-match of Gaia Data Release 3 (DR3) against the INT Galactic Plane Surveys (IGAPS) and the United Kingdom Infrared Deep Sky Survey (UKIDSS). The resulting cross-match of Galactic Plane Surveys (XGAPS) provides additional... Read More about XGAPS: a sub-arcsec cross-match of galactic plane surveys.

Outer disc edge: properties of low-frequency aperiodic variability in ultracompact interacting binaries (2022)
Journal Article
Veresvarska, M., & Scaringi, S. (2022). Outer disc edge: properties of low-frequency aperiodic variability in ultracompact interacting binaries. Monthly Notices of the Royal Astronomical Society, 518(4), 5576-5589. https://doi.org/10.1093/mnras/stac3470

Flickering, and more specifically aperiodic broad-band variability, is an important phenomenon used in understanding the geometry and dynamics of accretion flows. Although the inner regions of accretion flows are known to generate variability on rela... Read More about Outer disc edge: properties of low-frequency aperiodic variability in ultracompact interacting binaries.