Research

Article
Gençali, Ali Arda and Ertan, Ünal, (2024) “Long-term evolutionary links between the isolated neutron star populations”, Monthly Notices of the Royal Astronomical Society, Vol.534, No.2, 1481-1489 (SCI)
Niang, Ndiogou and Ertan, Ünal and Gençali, Ali Arda and Toyran, Ozan and Ulubay, Ayşe and Devlen, Ebru and Alpar, M. Ali and Gügercinoğlu, Erbil, (2024) “On the lack of X-ray pulsation in most neutron star low-mass X-ray binaries”, Monthly Notices of the Royal Astronomical Society, Vol.532, No.2, 2133-2142 (SCI)
Çoban, Ömer Faruk and Ertan, Ünal, (2024) “Typical x-ray outburst light curves of Aql X-1”, Astrophysical Journal, Vol.961, No.2 (SCI)
Gençali, Ali Arda and Ertan, Ünal and Alpar, M. Ali, (2023) “Evolution of the long-period pulsar PSR J0901-4046”, Monthly Notices of the Royal Astronomical Society: Letters, Vol.520, No.1, L11-L15 (SCI)
Gençali, Ali Arda and Ertan, Ünal and Alpar, M. Ali, (2022) “Evolution of the long-period pulsar GLEAM-X J162759.5-523504.3”, Monthly Notices of the Royal Astronomical Society: Letters, Vol.513, No.1, L68-L71 (SCI)
Gençali, Ali Arda and Niang, Ndiogou and Toyran, Ozan and Ertan, Ünal and Ulubay, A. and Şaşmaz, S. and Devlen, E. and Vahdat, A. and Özcan, S. and Alpar, M. Ali, (2022) “The torque reversals of 4U 1626-67”, Astronomy and Astrophysics, Vol.658 (SCI)
Ertan, Ünal and Alpar, M. Ali, (2021) “The minimum rotation period of millisecond pulsars”, Monthly Notices of the Royal Astronomical Society: Letters, Vol.505, No.1, L112-L114 (SCI)
Gençali, Ali Arda and Ertan, Ünal, (2021) “On the long-term evolution of rotating radio transients”, Monthly Notices of the Royal Astronomical Society, Vol.500, No.3, 3281-3289 (SCI)
Ertan, Ünal, (2021) “On the torque reversals of accreting neutron stars”, Monthly Notices of the Royal Astronomical Society, Vol.500, No.3, 2928-2936 (SCI)
Özcan, Şeyda and Gençali, Ali Arda and Ertan, Ünal, (2020) “Is PSR J0726-2612 a dim isolated neutron star progenitor?”, Monthly Notices of the Royal Astronomical Society, Vol.498, No.1, 674-679 (SCI)
Gençali, Ali Arda and Ertan, Ünal, (2018) “Long-term evolution of RRAT J1819-1458”, Monthly Notices of the Royal Astronomical Society, Vol.481, No.1, 244-249 (SCI)
Ertan, Ünal, (2018) “Accretion and propeller torque in the spin-down phase of neutron stars: the case of transitional millisecond pulsar PSR J1023+0038”, Monthly Notices of the Royal Astronomical Society, Vol.479, No.1, L12-L16 (SCI)
Posselt, B. and Pavlov, G. G. and Ertan, Ünal and Kaya, Şirin and Luhman, K. L. and Williams, C. C., (2018) “Discovery of extended infrared emission around the neutron star RXJ0806.4-4123”, Astrophysical Journal, Vol.865, No.1 (SCI)
Benli, Onur and Ertan, Ünal, (2018) “Central compact objects: some of them could be spinning up?”, Monthly Notices of the Royal Astronomical Society, Vol.478, No.4, 4890-4893 (SCI)
Benli, Onur and Ertan, Ünal, (2018) “Rotational and X-ray luminosity evolution of high-B radio pulsars”, New Astronomy, Vol.61, 78-83 (SCI)
Benli, Onur and Ertan, Ünal, (2017) “On the evolution of high-B radio pulsars with measured braking indices”, Monthly Notices of the Royal Astronomical Society, Vol.471, No.3, 2553-2557 (SCI)
Ertan, Ünal and Çalışkan, Şirin and Alpar, M. Ali, (2017) “Optical excess of dim isolated neutron stars”, Monthly Notices of the Royal Astronomical Society, Vol.470, No.1, 1253-1258 (SCI)
Ertan, Ünal, (2017) “The inner disc radius in the propeller phase and accretion-propeller transition of neutron stars”, Monthly Notices of the Royal Astronomical Society, Vol.466, No.1, 175-180 (SCI)
Benli, Onur and Ertan, Ünal, (2016) “Long-term evolution of anomalous x-ray pulsars and soft gamma repeaters”, Monthly Notices of the Royal Astronomical Society, Vol.457, No.4, 4114-4122 (SCI)
Benli, Onur and Çalışkan, Şirin and Ertan, Ünal, (2015) “Long-term evolution, x-ray outburst and optical/infrared emission of SGR 0501+4516”, Monthly Notices of the Royal Astronomical Society, Vol.447, No.3, 2282-2286 (SCI)
Ertan, Ünal and Çalışkan, Şirin and Benli, Onur and Alpar, M. Ali, (2014) “Long-term evolution of dim isolated neutron stars”, Monthly Notices of the Royal Astronomical Society, Vol.444, No.2, 1559-1565 (SCI)
Kylafis, N. D. and Trümper, J. E. and Ertan, Ünal, (2014) “Spectral formation in a radiative shock: application to anomalous X-ray pulsars and soft gamma-ray repeaters”, Astronomy and Astrophysics, Vol.562 (SCI)
Benli, Onur and Çalışkan, Şirin and Ertan, Ünal and Alpar, M. Ali and Trümper, J. E. and Kylafis, N. D., (2013) “X-ray enhancement and long-term evolution of swift J1822.3-1606”, Astrophysical Journal, Vol.778, No.2 (SCI)
Çalışkan, Şirin and Ertan, Ünal and Alpar, M. Ali and Trümper, J. E. and Kylafis, N. D., (2013) “On the evolution of the radio pulsar PSR J1734-3333”, Monthly Notices of the Royal Astronomical Society, Vol.431, No.2, 1136-1142 (SCI)
Trümper, J. E. and Dennerl, K. and Kylafis, N. D. and Ertan, Ünal and Zezas, A., (2013) “An accretion model for the anomalous x-ray pulsar 4U 0142+61”, Astrophysical Journal, Vol.764, No.1, 49-58 (SCI)
Çalışkan, Şirin and Ertan, Ünal, (2012) “On the x-ray outbursts of transient anomalous x-ray pulsars and soft gamma-ray repeaters”, Astrophysical Journal, Vol.758, No.2 (SCI)
Feroci, Marco and Stella, L. and Van der Klis, M. and Courvoisier, T. J.-L. and Hernanz, M. and Hudec, R. and Santangelo, A. and Walton, D. and Zdziarski, A. and Barret, D. and Belloni, T. and Braga, J. and Brandt, S. and Budtz-Jrgensen, C. and Campana, S. and Den Herder, J.-W. and Huovelin, J. and Israel, G. L. and Pohl, M. and Ray, P. and Vacchi, A. and Zane, S. and Argan, A. and Attina, P. and Bertuccio, G. and Bozzo, E. and Campana, R. and Chakrabarty, D. and Costa, E. and De Rosa, A. and Del Monte, E. and Di Cosimo, S. and Donnarumma, I. and Evangelista, Y. and Haas, D. and Jonker, P. and Korpela, S. and Labanti, C. and Malcovati, P. and Mignani, R. and Muleri, F. and Rapisarda, M. and Rashevsky, A. and Rea, N. and Rubini, A. and Tenzer, C. and Wilson-Hodge, C. and Winter, B. and Wood, K. and Zampa, G. and Zampa, N. and Abramowicz, M. A. and Alpar, M. Ali and Altamirano, D. and Alvarez, J. M. and Amati, L. and Amoros, C. and Antonelli, L. A. and Artigue, R. and Azzarello, P. and Bachetti, M. and Baldazzi, G. and Barbera, M. and Barbieri, C. and Basa, S. and Baykal, A. and Belmont, R. and Boirin, L. and Bonvicini, V. and Burderi, L. and Bursa, M. and Cabanac, C. and Cackett, E. and Caliandro, G. A. and Casella, P. and Chaty, S. and Chenevez, J. and Coe, M. J. and Collura, A. and Corongiu, A. and Covino, S. and Cusumano, G. and D’Amico, F. and Dall’Osso, S. and De Martino, D. and De Paris, G. and Di Persio, G. and Di Salvo, T. and Done, C. and Dovciak, M. and Drago, A. and Ertan, Ünal and Fabiani, S. and Falanga, M. and Fender, R. and Ferrando, P. and Della Monica Ferreira, D. and Fraser, G. and Frontera, F. and Fuschino, F. and Galvez, J. L. and Gandhi, P. and Giommi, P. and Godet, O. and Göğüş, Ersin and Goldwurm, A. and Götz, D. and Grassi, M. and Guttridge, P. and Hakala, P. and Henri, G. and Hermsen, W. and Horak, J. and Hornstrup, A. and In ‘t Zand, J. J. M. and Isern, J. and Kalemci, Emrah and Kanbach, G. and Karas, V. and Kataria, D. and Kennedy, T. and Klochkov, D. and Kluzniak, W. and Kokkotas, K. and Kreykenbohm, I. and Krolik, J. and Kuiper, L. and Kuvvetli, I. and Kylafis, N. and Lattimer, J. M. and Lazzarotto, F. and Leahy, D. and Lebrun, F. and Lin, D. and Lund, N. and Maccarone, T. and Malzac, J. and Marisaldi, M. and Martindale, A. and Mastropietro, M. and McClintock, J. and McHardy, I. and Mendez, M. and Mereghetti, S. and Miller, M. C. and Mineo, T. and Morelli, E. and Morsink, S. and Motch, C. and Motta, S. and Munoz Darias, T. and Naletto, G. and Neustroev, V. and Nevalainen, J. and Olive, J. F. and Orio, M. and Orlandini, M. and Orleanski, P. and Ozel, F. and Pacciani, L. and Paltani, S. and Papadakis, I. and Papitto, A. and Patruno, A. and Pellizzoni, A. and Petracek, V. and Petri, J. and Petrucci, P. O. and Phlips, B. and Picolli, L. and Possenti, A. and Psaltis, D. and Rambaud, D. and Reig, P. and Remillard, R. and Rodriguez, J. and Romano, P. and Romanova, M. and Schanz, T. and Schmid, C. and Segreto, A. and Shearer, A. and Smith, A. and Smith, P. J. and Soffitta, P. and Stergioulas, N. and Stolarski, M. and Stuchlik, Z. and Tiengo, A. and Torres, D. and Török, G. and Turolla, R. and Uttley, P. and Vaughan, S. and Vercellone, S. and Waters, R. and Watts, A. and Wawrzaszek, R. and Webb, N. and Wilms, J. and Zampieri, L. and Zezas, A. and Ziolkowski, J., (2011) “The large observatory for x-ray timing (LOFT)”, Experimental Astronomy (Sl), Vol.34, No.2, 415-444 (SCI)
Alpar, M. Ali and Ertan, Ünal and Çalışkan, Şirin, (2011) “SGR 0418+5729 – How does a young neutron star spin down to a 9 s period with a dipole field less than 10(13) G?”, The Astrophysical Journal Letters, Vol.732, No.1, L4-L7 (SCI)
Trümper, J. E. and Zezas, A. and Ertan, Ünal and Kylafis, N. D., (2010) “The energy spectrum of anomalous X-ray pulsars and soft gamma-ray repeaters”, Astronomy and Astrophysics, Vol.518 (SCI)
Ertan, Ünal and Ekşi, Kazım Yavuz and Erkut, Mehmet Hakan and Alpar, M. Ali, (2009) “On the evolution of anomalous x-ray pulsars and soft gamma-ray repeaters with fall back disks”, The Astrophysical Journal, Vol.702, No.2, 1309-1320 (SCI)
Ertan, Ünal and Erkut, M. Hakan, (2008) “On the X-ray light curve, pulsed-radio emission, and spin frequency evolution of the transient anomalous X-ray pulsar XTE J1810-197 during its X-ray outburst”, The Astrophysical journal, Vol.673, No.2, 1062-1066 (SCI)
Ertan, Ünal and Alpar, M. Ali and Erkut, Mehmet Hakan and Ekşi, K. Y. and Çalışkan, Ş., (2007) “Anomalous X-ray pulsars: persistent states with fallback disks”, Astrophysics and Space Science, Vol.308, No.1-4, 73-77 (SCI)
Ertan, Ünal and Erkut, Mehmet Hakan and Ekşi, Kazım Yavuz and Alpar, M. Ali, (2007) “The anomalous X-ray pulsar 4U 0142+61: a neutron star with a gaseous fallback disk”, The Astrophysical Journal, Vol.657, No.1, 441-447 (SCI)
Ertan, Ünal and Çalışkan, Şirin, (2006) “Optical and infrared emission from the anomalous X-Ray pulsars and soft gamma-ray repeaters”, The Astrophysical journal, Vol.649, No.2, L87-L90 (SCI)
Ertan, Ünal and Göğüş, Ersin and Alpar, M. Ali, (2006) “X-ray and infrared enhancement of anomalous x-ray pulsar 1E 2259+586”, The Astrophysical journal, Vol.640, No.1, 435-440 (SCI)
Ertan, Ünal and Cheng, K. S., (2004) “On the radio emission following the August 27 giant flare of SGR 1900+14”, New astronomy, Vol.9, No.7, 503-507 (SCI)
Ertan, Ünal and Cheng, K. S., (2004) “On the infrared, optical, and high-energy emission from the anomalous X-ray pulsar 4U 0142+61”, Astrophysical Journal, Vol.605, No.Issue:, 840-845 (SCI)
Ertan, Ünal and Alpar, M. Ali, (2003) “On the enhanced X-ray emission from SGR 1900+14 after the August 27 giant flare”, Astrophysical Journal, Vol.593, No.2, L93-L96 (SCI)
Ertan, Ünal and Alpar, M. Ali, (2002) “On the outbursts of black hole soft x-ray transients”, Astronomy and Astrophysics, Vol.393, No.1, 205-214 (SCI)

Book
Astrophysics of neutron stars 2010: a conference in honor of M. Ali Alpar: Çeşme, İzmir, Turkey, 2-6 August 2010, Göğüş, Ersin and Belloni, Tomaso and Ertan, Ünal (eds.), Melville, New York: American Institute of Physics 2011

Papers in Conference Proceedings
Ertan, Ünal, “Düşük kütleli x-ışını çiftlerinde nötron yıldızları“, 22. Ulusal Astronomi Kongresi, Türk Astronomi Derneği, December 2023, 1-6
Ertan, Ünal and Çalışkan, Şirin and Alpar, M. Ali, ” Genç nötron yıldızı sistemlerinin yayılma diskleriyle evrimi “, XVIII. Ulusal Astronomi ve Uzay Bilimleri Kongresi, Malatya, Türkiye: İnönü Üniversitesi, November 2012
Ertan, Ünal and Çalışkan, Şirin and Ekşi, Kazım Yavuz and Erkut, Mehmet Hakan and Alpar, M. Ali, “A natural limit on the observable periods of anomalous x-ray pulsars and soft gamma-ray repeaters“, Göğüş, Ersin and Belloni, Tomaso and Ertan, Ünal (eds.), Astrophysics of Neutron Stars 2010: A Conference in Honor of M. Ali Alpar, Melville, New York: American Institute of Physics, October 2011, 160-165
Posselt, B. and Schreyer, K. and Ertan, Ünal and Trippe, S. and Menten, K. and Klein, B., “Millimeter interferometer observations of the magnetar 4U 0142+61“, Göğüş, Ersin and Belloni, Tomaso and Ertan, Ünal (eds.), Astrophysics of Neutron Stars 2010: A Conference in Honor of M. Ali Alpar, Melville, New York: Amercan Institute of Physics, October 2011, 152-155
Çalışkan, Şirin and Ertan, Ünal, “X-ray outbursts of AXPs and SGRs“, Göğüş, Ersin and Belloni, Tomaso and Ertan, Ünal (eds.), Astrophysics of Neutron Stars 2010: A Conference in Honor of M. Ali Alpar, Melville, New York: Amercan Institute of Physics, October 2010, 199-200
Ertan, Ünal and Alpar, M. Ali, “On the enhanced X-ray emission from SGR 1900+14 after the August 27th giant flare“, Van den Heuvel, E. P. J. and Wijers, R. A. M. J. and In ‘t Zand, J. J. M. (eds.), 2nd BeppoSAX Conference on Restless High-Engery Universe, Amsterdam, Netherlands: Elsevier, June 2004, 530-535
Alpar, M. Ali and Çalışkan, Şirin and Ertan, Ünal, “Fallback disks, magnetars and other neutron stars“, Zhang, C. M. and Belloni, T. and Mendez, M. and Zhang, S. N. (eds.), Feeding Compact Objects: Accretion on All Scales, Paris, France: IAU (International Astronomical Union) (forthcoming)
Alpar, M. Ali and Ertan, Ünal and Erkut, M. Hakan and Ekşi, Kazım. Yavuz and Çalışkan, Şirin, “On fallback disks and magnetars“, The 36th COSPAR Scientific Assembly- on Space Research, (forthcoming)
Ertan, Ünal and Ekşi, Kazım Yavuz and Erkut, M. Hakan and Alpar, M. Ali, “The anomalous x-ray pulsar 4U 0142+61: a neutron star with a gaseous fallback disk“, Isolated Neutron Stars from the Interior to the Surface, (forthcoming)

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