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Your search keyword '"Fox-Machado, L."' showing total 14 results
Start Over Author "Fox-Machado, L." Publisher oxford university press (oup)
14 results on '"Fox-Machado, L."'

1. TESS Cycle 2 observations of roAp stars with 2-min cadence data

Author

Holdsworth, D L, primary, Cunha, M S, additional, Lares-Martiz, M, additional, Kurtz, D W, additional, Antoci, V, additional, Barceló Forteza, S, additional, De Cat, P, additional, Derekas, A, additional, Kayhan, C, additional, Ozuyar, D, additional, Skarka, M, additional, Hey, D R, additional, Shi, F, additional, Bowman, D M, additional, Kobzar, O, additional, Ayala Gómez, A, additional, Bognár, Zs, additional, Buzasi, D L, additional, Ebadi, M, additional, Fox-Machado, L, additional, García Hernández, A, additional, Ghasemi, H, additional, Guzik, J A, additional, Handberg, R, additional, Handler, G, additional, Hasanzadeh, A, additional, Jayaraman, R, additional, Khalack, V, additional, Kochukhov, O, additional, Lovekin, C C, additional, Mikołajczyk, P, additional, Mkrtichian, D, additional, Murphy, S J, additional, Niemczura, E, additional, Olafsson, B G, additional, Pascual-Granado, J, additional, Paunzen, E, additional, Posiłek, N, additional, Ramón-Ballesta, A, additional, Safari, H, additional, Samadi-Ghadim, A, additional, Smalley, B, additional, Sódor, Á, additional, Stateva, I, additional, Suárez, J C, additional, Szabó, R, additional, Wu, T, additional, Ziaali, E, additional, Zong, W, additional, and Seager, S, additional

Published
2023
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2. TESS cycle 1 observations of roAp stars with 2-min cadence data

Author

Holdsworth, D. L., Cunha, M. S., Kurtz, D. W., Antoci, V, Hey, D. R., Bowman, D. M., Kobzar, O., Buzasi, D. L., Kochukhov, Oleg, Niemczura, E., Ozuyar, D., Shi, F., Szabo, R., Samadi-Ghadim, A., Bognar, Zs, Fox-Machado, L., Khalack, V, Lares-Martiz, M., Lovekin, C. C., Mikolajczyk, P., Mkrtichian, D., Pascual-Granado, J., Paunzen, E., Richey-Yowell, T., Sodor, A., Sikora, J., Yang, T. Z., Brunsden, E., David-Uraz, A., Derekas, A., Garcia Hernandez, A., Guzik, J. A., Hatamkhani, N., Handberg, R., Lambert, T. S., Lampens, P., Murphy, S. J., Monier, R., Pollard, K. R., Quitral-Manosalva, P., Ramon-Ballesta, A., Smalley, B., Stateva, I, Vanderspek, R., Holdsworth, D. L., Cunha, M. S., Kurtz, D. W., Antoci, V, Hey, D. R., Bowman, D. M., Kobzar, O., Buzasi, D. L., Kochukhov, Oleg, Niemczura, E., Ozuyar, D., Shi, F., Szabo, R., Samadi-Ghadim, A., Bognar, Zs, Fox-Machado, L., Khalack, V, Lares-Martiz, M., Lovekin, C. C., Mikolajczyk, P., Mkrtichian, D., Pascual-Granado, J., Paunzen, E., Richey-Yowell, T., Sodor, A., Sikora, J., Yang, T. Z., Brunsden, E., David-Uraz, A., Derekas, A., Garcia Hernandez, A., Guzik, J. A., Hatamkhani, N., Handberg, R., Lambert, T. S., Lampens, P., Murphy, S. J., Monier, R., Pollard, K. R., Quitral-Manosalva, P., Ramon-Ballesta, A., Smalley, B., Stateva, I, and Vanderspek, R.

Abstract

We present the results of a systematic search for new rapidly oscillating Ap (roAp) stars using the 2-min cadence data collected by the Transiting Exoplanet Survey Satellite (TESS) during its Cycle 1 observations. We identify 12 new roAp stars. Amongst these stars we discover the roAp star with the longest pulsation period, another with the shortest rotation period, and six with multiperiodic variability. In addition to these new roAp stars, we present an analysis of 44 known roAp stars observed by TESS during Cycle 1, providing the first high-precision and homogeneous sample of a significant fraction of the known roAp stars. The TESS observations have shown that almost 60 percent (33) of our sample of stars are multiperiodic, providing excellent cases to test models of roAp pulsations, and from which the most rewarding asteroseismic results can be gleaned. We report four cases of the occurrence of rotationally split frequency multiplets that imply different mode geometries for the same degree modes in the same star. This provides a conundrum in applying the oblique pulsator model to the roAp stars. Finally, we report the discovery of non-linear mode interactions in alpha Cir (TIC402546736, HD128898) around the harmonic of the principal mode - this is only the second case of such a phenomenon.

Published
2021
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3. TESS Cycle 1 observations of roAp stars with 2-min cadence data

Author

Holdsworth, Daniel Luke, Cunha, M.S., Kurtz, Donald Wayne, Antoci, V., Hey, D.R., Bowman, D.M., Kobzar, O., Buzasi, D.L., Kochukhov, O., Niemczura, E., Ozuyar, D., Shi, F., Szabó, R., Samadi-Ghadim, A., Bognár, Zs., Fox-Machado, L., Khalack, V., Lares-Martiz, M., Lovekin, C.C., Mikołajczyk, P., Mkrtichian, D., Pascual-Granado, J., Paunzen, E., Richey-Yowell, T., Sódor, Á., Sikora, J., Yang, T.Z., Brunsden, E., David-Uraz, A., Derekas, A., García Hernández, A., Guzik, J.A., Hatamkhani, N., Handberg, R., Lambert, T.S., Lampens, P., Murphy, S.J., Monier, R., Pollard, K.R., Quitral-Manosalva, P., Ramón-Ballesta, A., Smalley, B., Stateva, I., Vanderspek, R., Holdsworth, Daniel Luke, Cunha, M.S., Kurtz, Donald Wayne, Antoci, V., Hey, D.R., Bowman, D.M., Kobzar, O., Buzasi, D.L., Kochukhov, O., Niemczura, E., Ozuyar, D., Shi, F., Szabó, R., Samadi-Ghadim, A., Bognár, Zs., Fox-Machado, L., Khalack, V., Lares-Martiz, M., Lovekin, C.C., Mikołajczyk, P., Mkrtichian, D., Pascual-Granado, J., Paunzen, E., Richey-Yowell, T., Sódor, Á., Sikora, J., Yang, T.Z., Brunsden, E., David-Uraz, A., Derekas, A., García Hernández, A., Guzik, J.A., Hatamkhani, N., Handberg, R., Lambert, T.S., Lampens, P., Murphy, S.J., Monier, R., Pollard, K.R., Quitral-Manosalva, P., Ramón-Ballesta, A., Smalley, B., Stateva, I., and Vanderspek, R.

Abstract

We present the results of a systematic search for new rapidly oscillating Ap (roAp) stars using the 2-min cadence data collected by the Transiting Exoplanet Survey Satellite (TESS) during its Cycle 1 observations. We identify 12 new roAp stars. Amongst these stars we discover the roAp star with the longest pulsation period, another with the shortest rotation period, and six with multiperiodic variability. In addition to these new roAp stars, we present an analysis of 44 known roAp stars observed by TESS during Cycle 1, providing the first high-precision and homogeneous sample of a significant fraction of the known roAp stars. The TESS observations have shown that almost 60 per cent (33) of our sample of stars are multiperiodic, providing excellent cases to test models of roAp pulsations, and from which the most rewarding asteroseismic results can be gleaned. We report four cases of the occurrence of rotationally split frequency multiplets that imply different mode geometries for the same degree modes in the same star. This provides a conundrum in applying the oblique pulsator model to the roAp stars. Finally, we report the discovery of non-linear mode interactions in $\alpha$ Cir (TIC 402546736, HD 128898) around the harmonic of the principal mode -- this is only the second case of such a phenomenon....

Published
2021

4. TESS cycle 1 observations of roAp stars with 2-min cadence data

Author

Holdsworth, D L, primary, Cunha, M S, additional, Kurtz, D W, additional, Antoci, V, additional, Hey, D R, additional, Bowman, D M, additional, Kobzar, O, additional, Buzasi, D L, additional, Kochukhov, O, additional, Niemczura, E, additional, Ozuyar, D, additional, Shi, F, additional, Szabó, R, additional, Samadi-Ghadim, A, additional, Bognár, Zs, additional, Fox-Machado, L, additional, Khalack, V, additional, Lares-Martiz, M, additional, Lovekin, C C, additional, Mikołajczyk, P, additional, Mkrtichian, D, additional, Pascual-Granado, J, additional, Paunzen, E, additional, Richey-Yowell, T, additional, Sódor, Á, additional, Sikora, J, additional, Yang, T Z, additional, Brunsden, E, additional, David-Uraz, A, additional, Derekas, A, additional, García Hernández, A, additional, Guzik, J A, additional, Hatamkhani, N, additional, Handberg, R, additional, Lambert, T S, additional, Lampens, P, additional, Murphy, S J, additional, Monier, R, additional, Pollard, K R, additional, Quitral-Manosalva, P, additional, Ramón-Ballesta, A, additional, Smalley, B, additional, Stateva, I, additional, and Vanderspek, R, additional

Published
2021
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5. The first view of δ Scuti and γ Doradus stars with the TESS mission

Author

Antoci, V, Cunha, M S, Bowman, D M, Murphy, S J, Kurtz, Donald Wayne, Bedding, T R, Borre, C C, Christophe, S, Daszyńska-Daszkiewicz, J, Fox-Machado, L, Hernández, A García, Ghasemi, H, Handberg, R, Hansen, H, Hasanzadeh, A, Houdek, G, Johnston, C, Justesen, A B, Alicavus, F Kahraman, Kotysz, K, Latham, D, Matthews, J M, Mønster, J, Niemczura, E, Paunzen, E, Arias, J P Sánchez, Pigulski, A, Pepper, J, Richey-Yowell, T, Safari, H, Seager, S, Smalley, B, Shutt, T, Sódor, A, Suárez, J-C, Tkachenko, A, Wu, T, Zwintz, K, Forteza, S Barceló, Brunsden, E, Bognár, Z, Buzasi, D L, Chowdhury, S, De Cat, P, Evans, J A, Guo, Z, Guzik, J A, Jevtic, N, Lampens, P, Martiz, M Lares, Lovekin, C, Li, G, Mirouh, G M, Mkrtichian, D, Monteiro, M J P F G, Nemec, J M, Ouazzani, R-M, Pascual-Granado, J, Reese, D R, Rieutord, M, Rodon, J R, Skarka, M, Sowicka, P, Stateva, I, Szabó, R, Weiss, W W, Antoci, V, Cunha, M S, Bowman, D M, Murphy, S J, Kurtz, Donald Wayne, Bedding, T R, Borre, C C, Christophe, S, Daszyńska-Daszkiewicz, J, Fox-Machado, L, Hernández, A García, Ghasemi, H, Handberg, R, Hansen, H, Hasanzadeh, A, Houdek, G, Johnston, C, Justesen, A B, Alicavus, F Kahraman, Kotysz, K, Latham, D, Matthews, J M, Mønster, J, Niemczura, E, Paunzen, E, Arias, J P Sánchez, Pigulski, A, Pepper, J, Richey-Yowell, T, Safari, H, Seager, S, Smalley, B, Shutt, T, Sódor, A, Suárez, J-C, Tkachenko, A, Wu, T, Zwintz, K, Forteza, S Barceló, Brunsden, E, Bognár, Z, Buzasi, D L, Chowdhury, S, De Cat, P, Evans, J A, Guo, Z, Guzik, J A, Jevtic, N, Lampens, P, Martiz, M Lares, Lovekin, C, Li, G, Mirouh, G M, Mkrtichian, D, Monteiro, M J P F G, Nemec, J M, Ouazzani, R-M, Pascual-Granado, J, Reese, D R, Rieutord, M, Rodon, J R, Skarka, M, Sowicka, P, Stateva, I, Szabó, R, and Weiss, W W

Abstract

We present the first asteroseismic results for δ Scuti and γ Doradus stars observed in Sectors 1 and 2 of the TESS mission. We utilise the 2-min cadence TESS data for a sample of 117 stars to classify their behaviour regarding variability and place them in the Hertzsprung-Russell diagram using Gaia DR2 data. Included within our sample are the eponymous members of two pulsator classes, γ Doradus and SX Phoenicis. Our sample of pulsating intermediate-mass stars observed by TESS also allows us to confront theoretical models of pulsation driving in the classical instability strip for the first time and show that mixing processes in the outer envelope play an important role. We derive an empirical estimate of 74% for the relative amplitude suppression factor as a result of the redder TESS passband compared to the Kepler mission using a pulsating eclipsing binary system. Furthermore, our sample contains many high-frequency pulsators, allowing us to probe the frequency variability of hot young δ Scuti stars, which were lacking in the Kepler mission data set, and identify promising targets for future asteroseismic modelling. The TESS data also allow us to refine the stellar parameters of SX Phoenicis, which is believed to be a blue straggler.

Published
2019

6. Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2

Author

Cunha, M S, Antoci, V, Holdsworth, Daniel Luke, Kurtz, Donald Wayne, Balona, L A, Bognár, Zs, Bowman, D M, Guo, Z, Kołaczek-Szymański, P A, Lares-Martiz, M, Paunzen, E, Skarka, M, Smalley, B, Sódor, Á, Kochukhov, O, Pepper, J, Richey-Yowell, T, Ricker, G R, Seager, S, Buzasi, D L, Fox-Machado, L, Hasanzadeh, A, Niemczura, E, Quitral-Manosalva, P, Monteiro, M J P F G, Stateva, I, De Cat, P, Hernández, A García, Ghasemi, H, Handler, G, Hey, D, Matthews, J M, Nemec, J M, Pascual-Granado, J, Safari, H, Suárez, J C, Szabó, R, Tkachenko, A, Weiss, W W, Cunha, M S, Antoci, V, Holdsworth, Daniel Luke, Kurtz, Donald Wayne, Balona, L A, Bognár, Zs, Bowman, D M, Guo, Z, Kołaczek-Szymański, P A, Lares-Martiz, M, Paunzen, E, Skarka, M, Smalley, B, Sódor, Á, Kochukhov, O, Pepper, J, Richey-Yowell, T, Ricker, G R, Seager, S, Buzasi, D L, Fox-Machado, L, Hasanzadeh, A, Niemczura, E, Quitral-Manosalva, P, Monteiro, M J P F G, Stateva, I, De Cat, P, Hernández, A García, Ghasemi, H, Handler, G, Hey, D, Matthews, J M, Nemec, J M, Pascual-Granado, J, Safari, H, Suárez, J C, Szabó, R, Tkachenko, A, and Weiss, W W

Abstract

We present the first results from the Transiting Exoplanet Survey Satellite (TESS) on the ro- tational and pulsational variability of magnetic chemically peculiar A-type stars. We analyse TESS 2-min cadence data from sectors 1 and 2 on a sample of 83 stars. Five new rapidly oscillating Ap (roAp) stars are announced. One of these pulsates with periods around 4.7 min, making it the shortest period roAp star known to date. Four out of the five new roAp stars are multiperiodic. Three of these, and the singly-periodic one show the presence of rotational mode splitting. Individual frequencies are provided in all cases. In addition, seven previously known roAp stars are analysed. Additional modes of oscillation are found in some stars, while in others we are able to distinguish the true pulsations from possible aliases present in the ground-based data. We find that the pulsation amplitude in the TESS filter is typically a factor 6 smaller than that in the B filter which is usually used for ground-based observations. For four roAp stars we set constraints on the inclination angle and magnetic obliquity, through the application of the oblique pulsator model. We also confirm the absence of roAp-type pulsa- tions down to amplitude limits of 6 and 13 µmag, respectively, in two of the best characterised non-oscillating Ap (noAp) stars. We announce 27 new rotational variables along with their ro- tation periods, and provide different rotation periods for seven other stars. Finally, we discuss how these results challenge state-of-the-art pulsation models for roAp stars.

Published
2019

7. The first view of δ Scuti and γ Doradus stars with the TESS mission

Author

Antoci, V, primary, Cunha, M S, additional, Bowman, D M, additional, Murphy, S J, additional, Kurtz, D W, additional, Bedding, T R, additional, Borre, C C, additional, Christophe, S, additional, Daszyńska-Daszkiewicz, J, additional, Fox-Machado, L, additional, García Hernández, A, additional, Ghasemi, H, additional, Handberg, R, additional, Hansen, H, additional, Hasanzadeh, A, additional, Houdek, G, additional, Johnston, C, additional, Justesen, A B, additional, Kahraman Alicavus, F, additional, Kotysz, K, additional, Latham, D, additional, Matthews, J M, additional, Mønster, J, additional, Niemczura, E, additional, Paunzen, E, additional, Sánchez Arias, J P, additional, Pigulski, A, additional, Pepper, J, additional, Richey-Yowell, T, additional, Safari, H, additional, Seager, S, additional, Smalley, B, additional, Shutt, T, additional, Sódor, A, additional, Suárez, J-C, additional, Tkachenko, A, additional, Wu, T, additional, Zwintz, K, additional, Barceló Forteza, S, additional, Brunsden, E, additional, Bognár, Z, additional, Buzasi, D L, additional, Chowdhury, S, additional, De Cat, P, additional, Evans, J A, additional, Guo, Z, additional, Guzik, J A, additional, Jevtic, N, additional, Lampens, P, additional, Lares Martiz, M, additional, Lovekin, C, additional, Li, G, additional, Mirouh, G M, additional, Mkrtichian, D, additional, Monteiro, M J P F G, additional, Nemec, J M, additional, Ouazzani, R-M, additional, Pascual-Granado, J, additional, Reese, D R, additional, Rieutord, M, additional, Rodon, J R, additional, Skarka, M, additional, Sowicka, P, additional, Stateva, I, additional, Szabó, R, additional, and Weiss, W W, additional

Published
2019
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8. Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2

Author

Cunha, M S, primary, Antoci, V, additional, Holdsworth, D L, additional, Kurtz, D W, additional, Balona, L A, additional, Bognár, Zs, additional, Bowman, D M, additional, Guo, Z, additional, Kołaczek-Szymański, P A, additional, Lares-Martiz, M, additional, Paunzen, E, additional, Skarka, M, additional, Smalley, B, additional, Sódor, Á, additional, Kochukhov, O, additional, Pepper, J, additional, Richey-Yowell, T, additional, Ricker, G R, additional, Seager, S, additional, Buzasi, D L, additional, Fox-Machado, L, additional, Hasanzadeh, A, additional, Niemczura, E, additional, Quitral-Manosalva, P, additional, Monteiro, M J P F G, additional, Stateva, I, additional, De Cat, P, additional, García Hernández, A, additional, Ghasemi, H, additional, Handler, G, additional, Hey, D, additional, Matthews, J M, additional, Nemec, J M, additional, Pascual-Granado, J, additional, Safari, H, additional, Suárez, J C, additional, Szabó, R, additional, Tkachenko, A, additional, and Weiss, W W, additional

Published
2019
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9. Precise determination of stellar parameters of the ZZ Ceti and DAZ white dwarf GD 133 through asteroseismology

Author

Fu, J-N, primary, Vauclair, G, additional, Su, J, additional, Fox Machado, L, additional, Colas, F, additional, Kim, S-L, additional, Cang, T Q, additional, Li, C, additional, Niu, H B, additional, Xue, H F, additional, Li, Y, additional, Jiang, X-J, additional, Michel, R, additional, Alvarez, M, additional, Dolez, N, additional, Ma, L, additional, Esamdin, A, additional, and Liu, J Z, additional

Published
2019
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11. Multisite photometric campaign on the high-amplitude δ Scuti star KIC 6382916

Author

Ulusoy, C., primary, Ulaş, B., additional, Gülmez, T., additional, Balona, L. A., additional, Stateva, I., additional, Iliev, I. Kh., additional, Dimitrov, D., additional, Kobulnicky, H. A., additional, Pickering, T. E., additional, Fox Machado, L., additional, Álvarez, M., additional, Michel, R., additional, Antoniuk, K., additional, Shakhovskoy, D. N., additional, Pit, N., additional, Damasso, M., additional, Cenadelli, D., additional, and Carbognani, A., additional

Published
2013
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12. Mode identification in the high-amplitude δ Scuti star V2367 Cyg

Author

Ulusoy, C., primary, Gülmez, T., additional, Stateva, I., additional, Dimitrov, D., additional, Iliev, I. Kh., additional, Kobulnicky, H. A., additional, Yaşarsoy, B., additional, Álvarez, M., additional, Michel, R., additional, Fox, Machado L., additional, Damasso, M., additional, Carbognani, A., additional, Cenadelli, D., additional, Pickering, T. E., additional, Kwon, J., additional, Tamura, M., additional, and Balona, L. A., additional

Published
2012
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14. The pulsating hot subdwarf Balloon 090100001: results of the 2005 multisite campaign

Author

Baran, A., primary, Oreiro, R., additional, Pigulski, A., additional, Hernández, F. Pérez, additional, Ulla, A., additional, Reed, M. D., additional, Rodríguez-López, C., additional, Moskalik, P., additional, Kim, S.-L., additional, Chen, W.-P., additional, Crowe, R., additional, Siwak, M., additional, Armendarez, L., additional, Binder, P. M., additional, Choo, K.-J., additional, Dye, A., additional, Eggen, J. R., additional, Garrido, R., additional, González Pérez, J. M., additional, Harms, S. L., additional, Huang, F.-Y., additional, Kozieł, D., additional, Lee, H.-T., additional, MacDonald, J., additional, Fox Machado, L., additional, Monserrat, T., additional, Stevick, J., additional, Stewart, S., additional, Terry, D., additional, Zhou, A.-Y., additional, and Zoła, S., additional

Published
2009
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