Dr Simone Scaringi's Outputs (91)

A Magnetic Valve at L1 Revealed in TESS Photometry of the Asynchronous Polar BY Cam (2022)
Journal Article
Mason, P. A., Littlefield, C., Monroy, L. C., Morales, J. F., Hakala, P., Garnavich, P., Szkody, P., Kennedy, M. R., Ramsay, G., & Scaringi, S. (2022). A Magnetic Valve at L1 Revealed in TESS Photometry of the Asynchronous Polar BY Cam. Astrophysical Journal, 938(2), https://doi.org/10.3847/1538-4357/ac91cf

We present TESS photometry of the asynchronous polar BY Cam, which undergoes a beat cycle between the 199.384 min white dwarf (WD) spin period and the 201.244 min orbital period. This results in changes in the flow of matter onto the WD. The TESS lig... Read More about A Magnetic Valve at L1 Revealed in TESS Photometry of the Asynchronous Polar BY Cam.

Locating the flickering source in polars (2022)
Journal Article
Iłkiewicz, K., Scaringi, S., Littlefield, C., & Mason, P. A. (2022). Locating the flickering source in polars. Monthly Notices of the Royal Astronomical Society, 516(4), https://doi.org/10.1093/mnras/stac2597

Flickering is a fast variability observed in all accreting systems. It has been shown that in most cataclysmic variables flickering originates in the accretion disc. However, in polars the strong magnetic field of the white dwarf prevents the formati... Read More about Locating the flickering source in polars.

Characterization of the eclipsing post-common-envelope binary TIC 60040774 (2022)
Journal Article
Priyatikanto, R., Knigge, C., Scaringi, S., Brink, J., & Buckley, D. (2022). Characterization of the eclipsing post-common-envelope binary TIC 60040774. Monthly Notices of the Royal Astronomical Society, 516(1), 1183-1192. https://doi.org/10.1093/mnras/stac2197

Binaries with a white dwarf primary and a main sequence secondary can be used to test our understanding of both single and binary star evolution. A small fraction of such systems experienced a common-envelope phase from which they emerged with a rela... Read More about Characterization of the eclipsing post-common-envelope binary TIC 60040774.

Hitting a New Low: The Unique 28 hr Cessation of Accretion in the TESS Light Curve of YY Dra (DO Dra) (2022)
Journal Article
Hill, K. L., Littlefield, C., Garnavich, P., Scaringi, S., Szkody, P., Mason, P. A., Kennedy, M. R., Shaw, A. W., & Covington, A. E. (2022). Hitting a New Low: The Unique 28 hr Cessation of Accretion in the TESS Light Curve of YY Dra (DO Dra). Astronomical Journal, 163(6), Article 246. https://doi.org/10.3847/1538-3881/ac5a51

We present the Transiting Exoplanet Surveying Satellite light curve of the intermediate polar YY Draconis (YY Dra, also known as DO Dra). The power spectrum indicates that while there is stream-fed accretion for most of the observational period, ther... Read More about Hitting a New Low: The Unique 28 hr Cessation of Accretion in the TESS Light Curve of YY Dra (DO Dra).

Localized thermonuclear bursts from accreting magnetic white dwarfs (2022)
Journal Article
Scaringi, S., Groot, P., Knigge, C., Bird, A., Breedt, E., Buckley, D., Cavecchi, Y., Degenaar, N., de Martino, D., Done, C., Fratta, M., Iłkiewicz, K., Koerding, E., Lasota, J.-P., Littlefield, C., Manara, C., O’Brien, M., Szkody, P., & Timmes, F. (2022). Localized thermonuclear bursts from accreting magnetic white dwarfs. Nature, 604(7906), 447-450. https://doi.org/10.1038/s41586-022-04495-6

Nova explosions are caused by global thermonuclear runaways triggered in the surface layers of accreting white dwarfs1,2,3. It has been predicted4,5,6 that localized thermonuclear bursts on white dwarfs can also take place, similar to type-I X-ray bu... Read More about Localized thermonuclear bursts from accreting magnetic white dwarfs.

Triggering micronovae through magnetically confined accretion flows in accreting white dwarfs (2022)
Journal Article
Scaringi, S., Groot, P., Knigge, C., Lasota, J.-P., de Martino, D., Cavecchi, Y., Buckley, D., & Camisassa, M. (2022). Triggering micronovae through magnetically confined accretion flows in accreting white dwarfs. Monthly Notices of the Royal Astronomical Society: Letters, 514(1), L11-L15. https://doi.org/10.1093/mnrasl/slac042

Rapid bursts at optical wavelengths have been reported for several accreting white dwarfs, where the optical luminosity can increase by up to a factor 30 in less than an hour fading on timescales of several hours, and where the energy release can rea... Read More about Triggering micronovae through magnetically confined accretion flows in accreting white dwarfs.

Discovery and analysis of three magnetic hot subdwarf stars: evidence for merger-induced magnetic fields (2022)
Journal Article
Pelisoli, I., Dorsch, M., Heber, U., Gänsicke, B., Geier, S., Kupfer, T., Németh, P., Scaringi, S., & Schaffenroth, V. (2022). Discovery and analysis of three magnetic hot subdwarf stars: evidence for merger-induced magnetic fields. Monthly Notices of the Royal Astronomical Society, 515(2), 2496-2510. https://doi.org/10.1093/mnras/stac1069

Magnetic fields can play an important role in stellar evolution. Among white dwarfs, the most common stellar remnant, the fraction of magnetic systems is more than 20 per cent. The origin of magnetic fields in white dwarfs, which show strengths rangi... Read More about Discovery and analysis of three magnetic hot subdwarf stars: evidence for merger-induced magnetic fields.

A persistent ultraviolet outflow from an accreting neutron star binary transient (2022)
Journal Article
Castro Segura, N., Knigge, C., Long, K., Altamirano, D., Armas Padilla, M., Bailyn, C., Buckley, D., Buisson, D., Casares, J., Charles, P., Combi, J., Cúneo, V., Degenaar, N., del Palacio, S., Díaz Trigo, M., Fender, R., Gandhi, P., Georganti, M., Gutiérrez, C., Hernandez Santisteban, J., …Wiseman, P. (2022). A persistent ultraviolet outflow from an accreting neutron star binary transient. Nature, 603(7899), 52-57. https://doi.org/10.1038/s41586-021-04324-2

All disc-accreting astrophysical objects produce powerful disc winds. In compact binaries containing neutron stars or black holes, accretion often takes place during violent outbursts. The main disc wind signatures during these eruptions are blue-shi... Read More about A persistent ultraviolet outflow from an accreting neutron star binary transient.

Rapid Bursts of Magnetically Gated Accretion in the Intermediate Polar V1025 Cen (2022)
Journal Article
Littlefield, C., Lasota, J.-P., Hameury, J.-M., Scaringi, S., Garnavich, P., Szkody, P., Kennedy, M., & Leichty, M. (2022). Rapid Bursts of Magnetically Gated Accretion in the Intermediate Polar V1025 Cen. Astrophysical Journal Letters, 924(1), https://doi.org/10.3847/2041-8213/ac4262

Magnetically gated accretion has emerged as a proposed mechanism for producing extremely short, repetitive bursts of accretion onto magnetized white dwarfs in intermediate polars (IPs), but this phenomenon has not been detected previously in a confir... Read More about Rapid Bursts of Magnetically Gated Accretion in the Intermediate Polar V1025 Cen.

Astrometric excess noise in Gaia EDR3 and the search for X-ray binaries (2021)
Journal Article
Gandhi, P., Buckley, D., Charles, P., Hodgkin, S., Scaringi, S., Knigge, C., Rao, A., Paice, J., & Zhao, Y. (2022). Astrometric excess noise in Gaia EDR3 and the search for X-ray binaries. Monthly Notices of the Royal Astronomical Society, 510(3), 3885-3895. https://doi.org/10.1093/mnras/stab3771

Astrometric noise (ϵ) in excess of parallax and proper motion is a potential signature of orbital wobble (ω) of individual components in binary star systems. The combination of X-ray selection with astrometric noise could then be a powerful tool for... Read More about Astrometric excess noise in Gaia EDR3 and the search for X-ray binaries.

SU Lyn - a transient symbiotic star (2021)
Journal Article
Iłkiewicz, K., Mikołajewska, J., Scaringi, S., Teyssier, F., Stoyanov, K. A., & Fratta, M. (2022). SU Lyn - a transient symbiotic star. Monthly Notices of the Royal Astronomical Society, 510(2), 2707-2717. https://doi.org/10.1093/mnras/stab3637

SU Lyn is a binary system composed of a white dwarf and a red giant star. Although it is known to be bright and variable at X-ray wavelengths, the optical counterpart of the source appeared as a single red giant without prominent emission lines. Beca... Read More about SU Lyn - a transient symbiotic star.

ASAS J071404+7004.3 – a close, bright nova-like cataclysmic variable with gusty winds (2021)
Journal Article
Inight, K., Gänsicke, B., Blondel, D., Boyd, D., Ashley, R., Knigge, C., Long, K., Marsh, T., McCleery, J., Scaringi, S., Steeghs, D., Thorstensen, J., Vanmunster, T., & Wheatley, P. (2021). ASAS J071404+7004.3 – a close, bright nova-like cataclysmic variable with gusty winds. Monthly Notices of the Royal Astronomical Society, 510(3), 3605-3621. https://doi.org/10.1093/mnras/stab3662

Despite being bright (V 11.8) and nearby (d = 212 pc) ASAS J071404+7004.3 has only recently been identified as a nova-like cataclysmic variable. We present time-resolved optical spectroscopy obtained at the Isaac Newton and the Hiltner and McGrawHill... Read More about ASAS J071404+7004.3 – a close, bright nova-like cataclysmic variable with gusty winds.

Searching for Diamagnetic Blob Accretion in the 74 day K2 Observation of V2400 Ophiuchi (2021)
Journal Article
Langford, A., Littlefield, C., Garnavich, P., Kennedy, M. R., Scaringi, S., & Szkody, P. (2022). Searching for Diamagnetic Blob Accretion in the 74 day K2 Observation of V2400 Ophiuchi. Astronomical Journal, 163(1), https://doi.org/10.3847/1538-3881/ac3010

Since its discovery in 1995, V2400 Ophiuchi (V2400 Oph) has stood apart from most known intermediate polar cataclysmic variables due to its proposed magnetic field strength (9–27 MG) and diskless accretion. To date, the exact accretion mechanism of t... Read More about Searching for Diamagnetic Blob Accretion in the 74 day K2 Observation of V2400 Ophiuchi.

High-resolution Hα imaging of the northern Galactic plane and the IGAPS image database (2021)
Journal Article
Greimel, R., Drew, J., Monguió, M., Ashley, R., Barentsen, G., Eislöffel, J., Mampaso, A., Morris, R., Naylor, T., Roe, C., Sabin, L., Stecklum, B., Wright, N., Groot, P., Irwin, M., Barlow, M., Fariña, C., Fernández-Martín, A., Parker, Q., Phillipps, S., …Zijlstra, A. (2021). High-resolution Hα imaging of the northern Galactic plane and the IGAPS image database. Astronomy & Astrophysics, 655, Article A49. https://doi.org/10.1051/0004-6361/202140950

The INT Galactic Plane Survey (IGAPS) is the merger of the optical photometric surveys IPHAS and UVEX based on data from the Isaac Newton Telescope (INT) obtained between 2003 and 2018. It captures the entire northern Galactic plane within the Galact... Read More about High-resolution Hα imaging of the northern Galactic plane and the IGAPS image database.

An accreting white dwarf displaying fast transitional mode switching (2021)
Journal Article
Scaringi, S., de Martino, D., Buckley, D., Groot, P., Knigge, C., Fratta, M., Iłkiewicz, K., Littlefield, C., & Papitto, A. (2022). An accreting white dwarf displaying fast transitional mode switching. Nature Astronomy, 6, 98-102. https://doi.org/10.1038/s41550-021-01494-x

Accreting white dwarfs are often found in close binary systems with orbital periods ranging from tens of minutes to several hours. In most cases, the accretion process is relatively steady, with significant modulations only occurring on timescales of... Read More about An accreting white dwarf displaying fast transitional mode switching.

TACOS: TESS AM CVn Outbursts Survey (2021)
Journal Article
Pichardo Marcano, M., Rivera Sandoval, L. E., Maccarone, T. J., & Scaringi, S. (2021). TACOS: TESS AM CVn Outbursts Survey. Monthly Notices of the Royal Astronomical Society, 508(3), 3275-3289. https://doi.org/10.1093/mnras/stab2685

Using Transiting Exoplanet Survey Satellite (TESS), we are doing a systematic study of outbursting AM CVn systems to place some limits on the current outbursts models. We present the TESS light curve (LC) for 9 AM CVns showing both superoutbursts (SO... Read More about TACOS: TESS AM CVn Outbursts Survey.

A characteristic optical variability time scale in astrophysical accretion disks (2021)
Journal Article
Burke, C. J., Shen, Y., Blaes, O., Gammie, C. F., Horne, K., Jiang, Y.-F., Liu, X., McHardy, I. M., Morgan, C. W., Scaringi, S., & Yang, Q. (2021). A characteristic optical variability time scale in astrophysical accretion disks. Science, 373(6556), 789-792. https://doi.org/10.1126/science.abg9933

Accretion disks around supermassive black holes in active galactic nuclei produce continuum radiation at ultraviolet and optical wavelengths. Physical processes in the accretion flow lead to stochastic variability of this emission on a wide range of... Read More about A characteristic optical variability time scale in astrophysical accretion disks.

Quasi-periodic Oscillations in the TESS Light Curve of TX Col, a Diskless Intermediate Polar on the Precipice of Forming an Accretion Disk (2021)
Journal Article
Littlefield, C., Scaringi, S., Garnavich, P., Szkody, P., Kennedy, M. R., Iłkiewicz, K., & Mason, P. A. (2021). Quasi-periodic Oscillations in the TESS Light Curve of TX Col, a Diskless Intermediate Polar on the Precipice of Forming an Accretion Disk. Astronomical Journal, 162(2), Article 49. https://doi.org/10.3847/1538-3881/ac062b

One of the fundamental properties of an intermediate polar is the dynamical nature of the accretion flow as it encounters the white dwarf’s (WD’s) magnetosphere. Many works have presumed a dichotomy between disk-fed accretion, in which the WD accrete... Read More about Quasi-periodic Oscillations in the TESS Light Curve of TX Col, a Diskless Intermediate Polar on the Precipice of Forming an Accretion Disk.

Population-based identification of H α-excess sources in the Gaia DR2 and IPHAS catalogues (2021)
Journal Article
Fratta, M., Scaringi, S., Drew, J., Monguió, M., Knigge, C., Maccarone, T., Court, J., Iłkiewicz, K., Pala, A., Gandhi, P., & Gänsicke, B. (2021). Population-based identification of H α-excess sources in the Gaia DR2 and IPHAS catalogues. Monthly Notices of the Royal Astronomical Society, 505(1), 1135-1152. https://doi.org/10.1093/mnras/stab1258

We present a catalogue of point-like H α-excess sources in the Northern Galactic Plane. Our catalogue is created using a new technique that leverages astrometric and photomeric information from Gaia to select H α-bright outliers in the INT Photometri... Read More about Population-based identification of H α-excess sources in the Gaia DR2 and IPHAS catalogues.

Exploring the tilted accretion disc of AQ Men with TESS (2021)
Journal Article
Iłkiewicz, K., Scaringi, S., Court, J. M., Maccarone, T. J., Altamirano, D., Bradshaw, C. W., Degenaar, N., Fratta, M., Littlefield, C., Shahbaz, T., & Wijnands, R. (2021). Exploring the tilted accretion disc of AQ Men with TESS. Monthly Notices of the Royal Astronomical Society, 503(3), 4050-4060. https://doi.org/10.1093/mnras/stab664

AQ Men is a nova-like variable that is presumed to have a tilted, precessing accretion disc. Grazing eclipses in this system have been speculated to be useful in exploring the geometry of its accretion disc. In this work, we analysed Transiting Exopl... Read More about Exploring the tilted accretion disc of AQ Men with TESS.