0000000000621145

AUTHOR

Adriano Ghedina

showing 4 related works from this author

Optical and ultraviolet pulsed emission from an accreting millisecond pulsar

2021

Ambrosino, F., et al.

Angular momentum010504 meteorology & atmospheric sciencesAstrophysics::High Energy Astrophysical PhenomenaMagnetosphereFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics01 natural sciencesLuminosityNeutron starsSettore FIS/05 - Astronomia E AstrofisicaPulsarMillisecond pulsar0103 physical sciencesAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsHigh Energy Astrophysical Phenomena0105 earth and related environmental sciencesPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Astronomy and AstrophysicsAccretion (astrophysics)Particle accelerationNeutron starAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical Phenomena
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Multi-band high resolution spectroscopy rules out the hot Jupiter BD+20 1790b - First data from the GIARPS Commissioning

2018

Context. Stellar activity is currently challenging the detection of young planets via the radial velocity (RV) technique. Aims. We attempt to definitively discriminate the nature of the RV variations for the young active K5 star BD+20 1790, for which visible (VIS) RV measurements show divergent results on the existence of a substellar companion. Methods. We compare VIS data with high precision RVs in the near infrared (NIR) range by using the GIANO - B and IGRINS spectrographs. In addition, we present for the first time simultaneous VIS-NIR observations obtained with GIARPS (GIANO - B and HARPS - N) at Telescopio Nazionale Galileo (TNG). Orbital RVs are achromatic, so the RV amplitude does …

PhysicsEarth and Planetary Astrophysics (astro-ph.EP)010308 nuclear & particles physicsFOS: Physical sciencesAstronomy and AstrophysicsContext (language use)Astrophysics01 natural sciences7. Clean energyRadial velocityPhotometry (astronomy)StarsAmplitudeAstrophysics - Solar and Stellar Astrophysics13. Climate actionSpace and Planetary SciencePlanet0103 physical sciencesHot JupiterSpectroscopy010303 astronomy & astrophysicsSolar and Stellar Astrophysics (astro-ph.SR)Astrophysics - Earth and Planetary Astrophysics
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Pulsating in Unison at Optical and X-Ray Energies: Simultaneous High Time Resolution Observations of the Transitional Millisecond Pulsar PSR J1023+00…

2019

PSR J1023+0038 is the first millisecond pulsar discovered to pulsate in the visible band; such a detection took place when the pulsar was surrounded by an accretion disk and also showed X-ray pulsations. We report on the first high time resolution observational campaign of this transitional pulsar in the disk state, using simultaneous observations in the optical (TNG, NOT, TJO), X-ray (XMM-Newton, NuSTAR, NICER), infrared (GTC) and UV (Swift) bands. Optical and X-ray pulsations were detected simultaneously in the X-ray high intensity mode in which the source spends $\sim$ 70% of the time, and both disappeared in the low mode, indicating a common underlying physical mechanism. In addition, o…

AccretionAccretion disks-pulsars: Individual (psr j1023+0038)-stars: Neutron-X-rays: Binaries010504 meteorology & atmospheric sciencesAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysics01 natural sciencesSettore FIS/05 - Astronomia E AstrofisicaPulsarAccretion discMillisecond pulsar0103 physical sciencesAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesHigh Energy Astrophysical Phenomena (astro-ph.HE)PhysicsAstrophysics::Instrumentation and Methods for AstrophysicsX-rayAstronomy and AstrophysicsTime resolutionAccretion (astrophysics)Space and Planetary ScienceVisible bandAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaThe Astrophysical Journal
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Optical pulsations from a transitional millisecond pulsar

2017

Weakly magnetic, millisecond spinning neutron stars attain their very fast rotation through a 1E8-1E9 yr long phase during which they undergo disk-accretion of matter from a low mass companion star. They can be detected as accretion-powered millisecond X-ray pulsars if towards the end of this phase their magnetic field is still strong enough to channel the accreting matter towards the magnetic poles. When mass transfer is much reduced or ceases altogether, pulsed emission generated by particle acceleration in the magnetosphere and powered by the rotation of the neutron star is observed, preferentially in the radio and gamma-ray bands. A few transitional millisecond pulsars that swing betwee…

TELESCOPERAYAstrophysics::High Energy Astrophysical PhenomenaMagnetosphereFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesSEARCHESSettore FIS/05 - Astronomia E AstrofisicaPulsarMillisecond pulsarSIGNALS0103 physical sciencesAstrophysics::Solar and Stellar AstrophysicsPSR J1023+0038ACCRETION010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Millisecond010308 nuclear & particles physicsAstrophysics::Instrumentation and Methods for AstrophysicsAstronomy and AstrophysicsXSS J12270-4859Accretion (astrophysics)STATEParticle accelerationNeutron starVARIABILITYPolarAstrophysics::Earth and Planetary AstrophysicsEMISSIONAstrophysics - High Energy Astrophysical PhenomenaXSS J12270-4859; PSR J1023+0038; Ray; telescope; accretion; emission; variability; searches; signals; state
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