Sara Motta: Publications

A detailed radio study of the energetic, nearby, and puzzling GRB 171010A

Monthly Notices of the Royal Astronomical Society Oxford University Press 486:2 (2019) 2721-2729

Authors:

Joe Bright, A Horesh, Aj van der Horst, R Fender, Ge Anderson, Sara Motta, Sb Cenko, Da Green, Y Perrott, D Titterington

Abstract:

We present the results of an intensive multi-epoch radio frequency campaign on the energetic and nearby GRB 171010A with the Karl G. Janksy Very Large Array and Arcminute Microkelvin Imager Large Array. We began observing GRB 171010A a day after its initial detection, and were able to monitor the temporal and spectral evolution of the source over the following weeks. The spectra and their evolution are compared to the canonical theories for broad-band GRB afterglows, with which we find a general agreement. There are, however, a number of features that are challenging to explain with a simple forward shock model, and we discuss possible reasons for these discrepancies. This includes the consideration of the existence of a reverse shock component, potential microphysical parameter evolution, and the effect of scintillation.

51�� of the X-ray properties of the neutron star binary 4U 1728–34 from the soft-to-hard state

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 484:3 (2019) 3004-3016

Authors:

Yanan Wang, Mariano Méndez, Diego Altamirano, Guobao Zhang, TM Belloni, Evandro M Ribeiro, M Linares, Andrea Sanna, SE Motta, John A Tomsick

Accretion in strong field gravity with eXTP

Science China Physics, Mechanics & Astronomy Springer Nature 62:2 (2019) 29504

Authors:

Alessandra De Rosa, Phil Uttley, LiJun Gou, Yuan Liu, Cosimo Bambi, Didier Barret, Tomaso Belloni, Emanuele Berti, Stefano Bianchi, Ilaria Caiazzo, Piergiorgio Casella, Marco Feroci, Valeria Ferrari, Leonardo Gualtieri, Jeremy Heyl, Adam Ingram, Vladimir Karas, FangJun Lu, Bin Luo, Giorgio Matt, Sara Motta, Joseph Neilsen, Paolo Pani, Andrea Santangelo, XinWen Shu, JunFeng Wang, Jian-Min Wang, YongQuan Xue, YuPeng Xu, WeiMin Yuan, YeFei Yuan, Shuang-Nan Zhang, Shu Zhang, Ivan Agudo, Lorenzo Amati, Nils Andersson, Cristina Baglio, Pavel Bakala, Altan Baykal, Sudip Bhattacharyya, Ignazio Bombaci, Niccoló Bucciantini, Fiamma Capitanio, Riccardo Ciolfi, Wei K Cui, Filippo D’Ammando, Thomas Dauser, Melania Del Santo, Barbara De Marco, Tiziana Di Salvo, Chris Done, Michal Dovčiak, Andrew C Fabian, Maurizio Falanga, Angelo Francesco Gambino, Bruce Gendre, Victoria Grinberg, Alexander Heger, Jeroen Homan, Rosario Iaria, JiaChen Jiang, ChiChuan Jin, Elmar Koerding, Manu Linares, Zhu Liu, Thomas J Maccarone, Julien Malzac, Antonios Manousakis, Frédéric Marin, Andrea Marinucci, Missagh Mehdipour, Mariano Méndez, Simone Migliari, Cole Miller, Giovanni Miniutti, Emanuele Nardini, Paul T O’Brien, Julian P Osborne, Pierre Olivier Petrucci, Andrea Possenti, Alessandro Riggio, Jerome Rodriguez, Andrea Sanna, LiJing Shao, Malgosia Sobolewska, Eva Sramkova, Abigail L Stevens, Holger Stiele, Giulia Stratta, Zdenek Stuchlik, Jiri Svoboda, Fabrizio Tamburini, Thomas M Tauris, Francesco Tombesi, Gabriel Torok, Martin Urbanec, Frederic Vincent, QingWen Wu, Feng Yuan, Jean JM in’ t Zand, Andrzej A Zdziarski, XinLin Zhou

The long outburst of the black hole transient GRS 1716–249 observed in the X-ray and radio band

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 482:2 (2019) 1587-1601

Authors:

T Bassi, M Del Santo, A D’Aì, SE Motta, J Malzac, A Segreto, JCA Miller-Jones, P Atri, RM Plotkin, TM Belloni, T Mineo, AK Tzioumis

A connection between accretion states and the formation of ultra-relativistic outflows in a neutron star X-ray binary

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2018)

Authors:

SE Motta, RP Fender

Abstract:

The nearby accreting neutron star binary Sco X-1 is the closest example of ongoing relativistic jet production at high Eddington ratios. Previous radio studies have revealed that alongside mildly relativistic, radio-emitting ejecta, there is at times a much faster transfer of energy from the region of the accretion flow along the jet. The nature of this ultrarelativistic flow remains unclear and while there is some evidence for a similar phenomenon in other systems which might contain neutron stars, it has never been observed in a confirmed black hole system. We have compared these previous radio observations with a new analysis of simultaneous X-ray observations which were performed with the RXTE mission. We find that the ejection of the ultra-relativistic flow seems to be associated with the simultaneous appearance of two particular types of quasi-periodic oscillations in the X-ray power spectrum. In contrast, the mildly relativistic, radio-emitting outflows may be associated with flat-topped broad band noise in the X-ray power spectrum. This is the first time a link, albeit tentative, has been found between these mysterious unseen flows and the accretion flow from which they are launched.

51��

Sara Motta

Sub department

A detailed radio study of the energetic, nearby, and puzzling GRB 171010A

Authors:

Abstract:

51�� of the X-ray properties of the neutron star binary 4U 1728–34 from the soft-to-hard state

Authors:

Accretion in strong field gravity with eXTP

Authors:

The long outburst of the black hole transient GRS 1716–249 observed in the X-ray and radio band

Authors:

A connection between accretion states and the formation of ultra-relativistic outflows in a neutron star X-ray binary

Authors:

Abstract:

FIND US

CONTACT US

51�������

Sara Motta

Sub department

A detailed radio study of the energetic, nearby, and puzzling GRB 171010A

Authors:

Abstract:

51������� of the X-ray properties of the neutron star binary 4U 1728–34 from the soft-to-hard state

Authors:

Accretion in strong field gravity with eXTP

Authors:

The long outburst of the black hole transient GRS 1716–249 observed in the X-ray and radio band

Authors:

A connection between accretion states and the formation of ultra-relativistic outflows in a neutron star X-ray binary

Authors:

Abstract:

51��

51�� of the X-ray properties of the neutron star binary 4U 1728–34 from the soft-to-hard state