Abstract
Low-mass pre-main sequence (PMS) stars are strong X-ray sources, because they possess hot coronae like their older main-sequence counterparts. Unique to young stars, however, are X-rays from accretion and outflows, and both processes are of pivotal importance for star and planet formation. We describe how X-ray data provide important insight into the physics of accretion and outflows. First, mass accreted from a circumstellar disk onto the stellar surface reaches velocities up to a few hundred km/s, fast enough to generate soft X-rays in the post-shock region of the accretion shock. X-ray observations together with laboratory experiments and numerical simulations show that the accretion geometry is complex in young stars. Specifically, the center of the accretion column is likely surrounded by material shielding the inner flow from view but itself also hot enough to emit X-rays. Second, X-rays are observed in two locations of protostellar jets: an inner stationary emission component probably related to outflow collimation and outer components, which evolve within years and are likely related to working surfaces where the shock travels through the jet. Jet-powered X-rays appear to trace the fastest jet component and provide novel information on jet launching in young stars. We conclude that X-ray data will continue to be highly important for understanding star and planet formation, because they directly probe the origin of many emission features studied in other wavelength regimes. In addition, future X-ray missions will improve sensitivity and spectral resolution to probe key model parameters (e.g., velocities) in large samples of PMS stars.
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References
R.E. Ainsworth, A.M.M. Scaife, T.P. Ray et al., ApJ 792, L18 (2014)
B. Albertazzi, A. Ciardi, M. Nakatsutsumi et al., Science 346, 325 (2014)
S.H.P. Alencar, G. Basri, AJ 119, 1881 (2000)
P. André, J. Di Francesco, D. Ward-Thompson et al., in Protostars and Planets VI, University of Arizona Press, Tucson, ed. by H. Beuther, R.S. Klessen, C.P. Dullemond, T. Henning (2014), p. 27
P. Andre, D. Ward-Thompson, M. Barsony, ApJ 406, 122 (1993)
C. Argiroffi, E. Flaccomio, J. Bouvier et al., A&A 530, A1 (2011)
C. Argiroffi, A. Maggio, T. Montmerle et al., ApJ 752, 100 (2012)
C. Argiroffi, J.J. Drake, R. Bonito et al., A&A 607, A14 (2017)
M. Audard, P. Ábrahám, M.M. Dunham et al., in Protostars and Planets VI, University of Arizona Press, Tucson, ed. by H. Beuther, R.S. Klessen, C.P. Dullemond, T. Henning (2014), p. 387
F. Bacciotti, J. Eislöffel, A&A 342, 717 (1999)
F. Bacciotti, R. Mundt, T.P. Ray et al., ApJ 537, L49 (2000)
F. Bacciotti, E.T. Whelan, J.M. Alcalá et al., ApJ 737, L26 (2011)
S.A. Balbus, J.F. Hawley, ApJ 376, 214 (1991)
J. Bally, E. Feigelson, B. Reipurth, ApJ 584, 843 (2003)
C. Bertout, in IAU Symposium. Star-Disk Interaction in Young Stars, vol. 243, ed. by J. Bouvier, I. Appenzeller (2007), pp. 1–12
R.D. Blandford, D.G. Payne, MNRAS 199, 883 (1982)
R. Bonito, S. Orlando, G. Peres, F. Favata, R. Rosner, A&A 462, 645 (200)
R. Bonito, S. Orlando, M. Miceli et al., A&A 517, A68 (2010a)
R. Bonito, S. Orlando, G. Peres et al., A&A 511, A42 (2010b)
R. Bonito, S. Orlando, M. Miceli et al., ApJ 737, 54 (2011)
R. Bonito, S. Orlando, C. Argiroffi et al., ApJ 795, L34 (2014)
N.S. Brickhouse, S.R. Cranmer, A.K. Dupree, G.J.M. Luna, S. Wolk, ApJ 710, 1835 (2010)
K. Burdonov, G. Revet, R. Bonito et al., A&A 642, A38 (2020)
S.W. Burnham, MNRAS 51, 94 (1890)
S.W. Burnham, Publ. Lick Obs. 2, 168 (1894)
S. Cabrit, in Star-Disk Interaction in Young Stars, University of Arizona Press, Tucson, ed. by J. Bouvier, I. Appenzeller, vol. 243 (2007), pp. 203–214
N. Calvet, E. Gullbring, ApJ 509, 802 (1998)
S. Colombo, S. Orlando, G. Peres, C. Argiroffi, F. Reale, A&A 594, A93 (2016)
S. Colombo, L. Ibgui, S. Orlando et al., A&A 629, L9 (2019)
G. Costa, S. Orlando, G. Peres, C. Argiroffi, R. Bonito, A&A 597, A1 (2017)
R.L. Curran, C. Argiroffi, G.G. Sacco et al., A&A 526, A104 (2011)
L. de Sá, J.P. Chièze, C. Stehlé et al., A&A 630, A84 (2019)
A.V. Dodin, S.A. Lamzin, Astron. Lett. 38, 649 (2012)
A.V. Dodin, S.A. Lamzin, T.M. Sitnova, Astron. Lett. 39, 315 (2013)
J.F. Donati, M.M. Jardine, S.G. Gregory et al., MNRAS 386, 1234 (2008)
J.F. Donati, M.B. Skelly, J. Bouvier et al., MNRAS 402, 1426 (2010)
B.T. Draine, C.F. McKee, ARA&A 31, 373 (1993)
J.J. Drake, P. Testa, L. Hartmann, ApJ 627, L149 (2005)
M.M. Dunham, A.M. Stutz, L.E. Allen et al., in Protostars and Planets VI, University of Arizona Press, Tucson, ed. by H. Beuther, R.S. Klessen, C.P. Dullemond, T. Henning (2014), p. 195
A.K. Dupree, N.S. Brickhouse, S.R. Cranmer et al., ApJ 750, 73 (2012)
S. Edwards, W. Fischer, L. Hillenbrand, J. Kwan, ApJ 646, 319 (2006)
J. Eisloffel, R. Mundt, K.-H. Bohm, AJ 108, 1042 (1994)
C.C. Espaillat, C. Robinson, S. Grant, M. Reynolds, ApJ 876, 121 (2019)
C.C. Espaillat, C.E. Robinson, M.M. Romanova et al., Nature 597, 41 (2021)
F. Favata, C.V.M. Fridlund, G. Micela, S. Sciortino, A.A. Kaas, A&A 386, 204 (2002)
F. Favata, R. Bonito, G. Micela et al., A&A 450, L17 (2006)
C. Fendt, ApJ 651, 272 (2006)
C. Fendt, M. Čemeljić, A&A 395, 1045 (2002)
J. Ferreira, C. Dougados, S. Cabrit, A&A 453, 785 (2006)
A. Frank, T.P. Ray, S. Cabrit et al., in Protostars and Planets VI, University of Arizona Press, Tucson, ed. by H. Beuther, R.S. Klessen, C.P. Dullemond, T. Henning (2014), p. 451
C.V.M. Fridlund, R. Liseau, A.A. Djupvik et al., A&A 436, 983 (2005)
A.E. Glassgold, J. Najita, J. Igea, ApJ 615, 972 (2004)
M. Gong, E.C. Ostriker, ApJ 806, 31 (2015)
S.G. Gregory, J.F. Donati, J. Morin et al., ApJ 755, 97 (2012)
N. Grosso, E.D. Feigelson, K.V. Getman et al., A&A 448, L29 (2006)
N. Grosso, K. Hamaguchi, J.H. Kastner, M.W. Richmond, D.A. Weintraub, A&A 522, A56 (2010)
M. Güdel, A. Telleschi, A&A 474, L25 (2007)
M. Güdel, S.L. Skinner, K.R. Briggs et al., ApJ 626, L53 (2005)
M. Güdel, S.L. Skinner, S.Y. Mel’Nikov et al., A&A 468, 529 (2007a)
M. Güdel, A. Telleschi, M. Audard et al., A&A 468, 515 (2007b)
M. Güdel, S.L. Skinner, M. Audard, K.R. Briggs, S. Cabrit, A&A 478, 797 (2008)
M. Güdel, M. Audard, F. Bacciotti et al., in 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, ed. by C. Johns-Krull, M.K. Browning, A.A. West. Astronomical Society of the Pacific Conference Series, vol. 448 (2011), p. 617
E. Gullbring, H. Barwig, J.H.M.M. Schmitt, A&A 324, 155 (1997)
H.M. Günther, J.H.M.M. Schmitt, J. Robrade, C. Liefke, A&A 466, 1111 (2007)
H.M. Günther, P.C. Schneider, Z.Y. Li, A&A 552, A142 (2013a)
H.M. Günther, U. Wolter, J. Robrade, S.J. Wolk, ApJ 771, 70 (2013b)
H.M. Günther, Z.-Y. Li, P.C. Schneider, ApJ 795, 51 (2014)
G. Haro, ApJ 115, 572 (1952)
G. Haro, ApJ 117, 73 (1953)
P. Hartigan, J. Raymond, L. Hartmann, ApJ 316, 323 (1987)
P. Hartigan, A. Frank, P. Varniére, E.G. Blackman, ApJ 661, 910 (2007)
L. Hartmann, G. Herczeg, N. Calvet, ARA&A 54, 135 (2016)
C. Hayashi, PASJ 13, 450 (1961)
S. Heathcote, B. Reipurth, A.C. Raga, AJ 116, 1940 (1998)
G.H. Herbig, ApJ 111, 11 (1950)
G.H. Herbig, ApJ 113, 697 (1951)
D.P. Higginson, B. Khiar, G. Revet et al., Phys. Rev. Lett. 119, 255002 (2017)
A.H. Joy, ApJ 102, 168 (1945)
J.H. Kastner, D.P. Huenemoerder, N.S. Schulz, C.R. Canizares, D.A. Weintraub, ApJ 567, 434 (2002)
J.H. Kastner, G. Franz, N. Grosso et al., ApJS 160, 511 (2005)
M.A. Kuhn, L.A. Hillenbrand, ApJ 883, 117 (2019)
S.A. Lamzin, Astron. Rep. 42, 322 (1998)
S.A. Lamzin, Astron. Lett. 25, 430 (1999)
R.B. Larson, Rep. Progress Phys. 66, 1651 (2003)
C. Lavalley-Fouquet, S. Cabrit, C. Dougados, A&A 356, L41 (2000)
Y.-N. Lee, S.S.R. Offner, P. Hennebelle et al., Space Sci. Rev. 216, 70 (2020)
J.L. Linsky, M. Gagné, A. Mytyk, M. McCaughrean, M. Andersen, ApJ 654, 347 (2007)
C.-F. Liu, H. Shang, G.J. Herczeg, F.M. Walter, ApJ 909, 196 (2021)
J. López-Santiago, R. Bonito, M. Orellana et al., ApJ 806, 53 (2015)
A. Magazzu, R. Rebolo, I.V. Pavlenko, ApJ 392, 159 (1992)
E.E. Mamajek, in Exoplanets and Disks: Their Formation and Diversity, ed. by T. Usuda, M. Tamura, M. Ishii. American Institute of Physics Conference Series, vol. 1158 (2009), pp. 3–10
T. Matsakos, J.P. Chièze, C. Stehlé et al., A&A 557, A69 (2013)
S. Matt, R.E. Pudritz, ApJ 632, L135 (2005)
C.F. McKee, E.C. Ostriker, ARA&A 45, 565 (2007)
J.U. Ness, J.H.M.M. Schmitt, V. Burwitz et al., A&A 394, 911 (2002)
B. Nisini, T. Giannini, S. Antoniucci et al., A&A 595, A76 (2016)
B. Nisini, S. Antoniucci, J.M. Alcalá et al., A&A 609, A87 (2018)
S. Orlando, G.G. Sacco, C. Argiroffi et al., A&A 510, A71 (2010)
S. Orlando, R. Bonito, C. Argiroffi et al., A&A 559, A127 (2013)
P. Padoan, T. Haugbølle, Å. Nordlund, ApJ 797, 32 (2014)
S.H. Pravdo, Y. Tsuboi, ApJ 626, 272 (2005)
S.H. Pravdo, E.D. Feigelson, G. Garmire et al., Nature 413, 708 (2001)
S.H. Pravdo, Y. Tsuboi, Y. Maeda, ApJ 605, 259 (2004)
T. Preibisch, Y.-C. Kim, F. Favata et al., ApJS 160, 401 (2005)
R.E. Pudritz, C.A. Norman, ApJ 274, 677 (1983)
A.C. Raga, A. Noriega-Crespo, P.F. Velázquez, ApJ 576, L149 (2002)
F. Reale, S. Orlando, P. Testa et al., Science 341, 251 (2013)
F. Reale, S. Orlando, P. Testa, E. Landi, C.J. Schrijver, ApJ 797, L5 (2014)
G. Revet, S.N. Chen, R. Bonito et al., Sci. Adv. 3, E982 (2017)
C.E. Robinson, C.C. Espaillat, J.E. Owen, ApJ 908, 16 (2021)
J. Robrade, J.H.M.M. Schmitt, A&A 473, 229 (2007)
A. Rodríguez-Kamenetzky, C. Carrasco-González, A. Araudo, et al., ApJ 851, 16 (2017)
M.M. Romanova, A.V. Koldoba, G.V. Ustyugova et al., MNRAS 506, 372 (2021)
G.G. Sacco, S. Orlando, C. Argiroffi et al., A&A 522, A55 (2010)
P.C. Schneider, J.H.M.M. Schmitt, A&A 488, L13 (2008)
P.C. Schneider, H.M. Günther, J.H.M.M. Schmitt, A&A 508, 717 (2009)
P.C. Schneider, H.M. Günther, J.H.M.M. Schmitt, A&A 530, A123 (2011)
P.C. Schneider, H.M. Günther, J.H.M.M. Schmitt, A&A 542, A123 (2012)
P.C. Schneider, J. Eislöffel, M. Güdel et al., A&A 550, L1 (2013)
P.C. Schneider, H.M. Günther, J. Robrade, J.H.M.M. Schmitt, M. Güdel, A&A 618, A55 (2018)
P.C. Schneider, H.M. Günther, K. France, Galaxies 8, 27 (2020)
F. Shu, J. Najita, E. Ostriker et al., ApJ 429, 781 (1994)
S.L. Skinner, M. Audard, M. Güdel, ApJ 737, 19 (2011)
S.L. Skinner, P.C. Schneider, M. Audard, M. Güdel, ApJ 855, 143 (2018)
A.P. Sousa, J. Bouvier, S.H.P. Alencar et al., A&A 649, A68 (2021)
S.W. Stahler, F. Palla, The Formation of Stars (2004)
B. Stelzer, J.H.M.M. Schmitt, A&A 418, 687 (2004)
B. Stelzer, S. Hubrig, S. Orlando et al., A&A 499, 529 (2009)
D.A. Swartz, J.J. Drake, R.F. Elsner et al., ApJ 628, 811 (2005)
S. Takasao, T.K. Suzuki, K. Shibata, ApJ 847, 46 (2017)
W.K. Teets, D.A. Weintraub, N. Grosso et al., ApJ 741, 83 (2011)
M. Tsujimoto, K. Koyama, N. Kobayashi et al., PASJ 56, 341 (2004)
S. Ustamujic, S. Orlando, R. Bonito et al., A&A 596, A99 (2016)
S. Ustamujic, S. Orlando, R. Bonito, M. Miceli, A.I. Gómez de Castro, A&A 615, A124 (2018)
F. Villebrun, E. Alecian, G. Hussain et al., A&A 622, A72 (2019)
G.J. White, R. Liseau, A.B. Men’shchikov et al., A&A 364, 741 (2000)
M.C. White, P.J. McGregor, G.V. Bicknell, R. Salmeron, T.L. Beck, MNRAS 441, 1681 (2014)
Z. Xu, G.J. Herczeg, C.M. Johns-Krull, K. France, arXiv e-prints, arXiv:2107.11188 (2021)
C. Zanni, J. Ferreira, A&A 550, A99 (2013)
Y.B. Zel’dovich, Y.P. Raizer, Physics of shock waves and high-temperature hydrodynamic phenomena (1967)
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Schneider, P.C., Günther, H.M., Ustamujic, S. (2022). Pre-main Sequence: Accretion and Outflows. In: Bambi, C., Santangelo, A. (eds) Handbook of X-ray and Gamma-ray Astrophysics. Springer, Singapore. https://doi.org/10.1007/978-981-16-4544-0_81-1
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