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13 results on '"Mathiasen, M."'

1. Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry (vol 555, pg A36, 2013)

Author

Kains, N, Bramich, DM, Ferro, AA, Jaimes, RF, Jorgensen, UG, Giridhar, S, Penny, MT, Alsubai, KA, Andersen, JM, Bozza, V, Browne, P, Burgdorf', M, Novati, SC, Damerdji, Y, Diehl, C, Dodds, P, Dominik, M, Elyiv, A, Fang, X-S, Giannini, E, Hardis, S, Harpsoe, K, Hinse, TC, Hornstrup, A, Hundertmark, M, Jessen-Hansen, J, Juncher, D, Kerins, E, Kjeldsen, H, Korhonen, H, Liebig, C, Lund, MN, Lundkvist, M, Mancini, L, Martin, R, Mathiasen, M, Rabus, M, Rahvar, S, Ricci, D, Sahu, K, Scarpetta, G, Skottfelt, J, Snodgrass, C, Southworth, J, Surdej, J, Tregloan-Reed, J, Vilela, C, Wertz, O, Williams, A, and Consortium, M

Subjects
QC, QB
Abstract

Aims. We present the analysis of 26 nights of V and I time-series observations from 2011 and 2012 of the globular cluster M 30 (NGC 7099). We\ud used our data to search for variable stars in this cluster and refine the periods of known variables; we then used our variable star light curves to\ud derive values for the cluster’s parameters.\ud Methods. We used difference image analysis to reduce our data to obtain high-precision light curves of variable stars. We then estimated the cluster\ud parameters by performing a Fourier decomposition of the light curves of RR Lyrae stars for which a good period estimate was possible. We also\ud derived an estimate for the age of the cluster by fitting theoretical isochrones to our colour-magnitude diagram (CMD).\ud Results. Out of 13 stars previously catalogued as variables, we find that only 4 are bona fide variables. We detect two new RR Lyrae variables,\ud and confirm two additional RR Lyrae candidates from the literature. We also detect four other new variables, including an eclipsing blue straggler\ud system, and an SX Phoenicis star. This amounts to a total number of confirmed variable stars in M 30 of 12. We perform Fourier decomposition of\ud the light curves of the RR Lyrae stars to derive cluster parameters using empirical relations. We find a cluster metallicity [Fe/H]ZW = −2.01±0.04,\ud or [Fe/H]UVES = −2.11 ± 0.06, and a distance of 8.32 ± 0.20 kpc (using RR0 variables), 8.10 kpc (using one RR1 variable), and 8.35 ± 0.42 kpc\ud (using our SX Phoenicis star detection in M 30). Fitting isochrones to the CMD, we estimate an age of 13.0 ± 1.0 Gyr for M 30.

Published
2016

2. Erratum: Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry (Astronomy and Astrophysics (2013) 555 (A36))

Author

Kains, N, Bramich, Dm, Arellano Ferro, A, Figuera Jaimes, R, Jorgensen, Ug, Giridhar, S, Penny, Mt, Alsubai, Ka, Andersen, Jm, Bozza, V, Browne, P, Burgdorf, M, Calchi Novati, S, Damerdji, Y, Diehl, C, Dodds, P, Dominik, M, Elyiv, A, Fang, X, Giannini, E, S. -H., G, Hardis, S, Harpsoe, K, Hinse, Tc, Hornstrup, A, Hundertmark, M, Jessen-Hansen, J, Juncher, D, Kerins, E, Kjeldsen, H, Korhonen, H, Liebig, C, Lund, Mn, Lundkvist, M, Mancini, L, Martin, R, Mathiasen, M, Rabus, M, Rahvar, S, Ricci, D, Sahu, K, Scarpetta, G, Skottfelt, J, Snodgrass, C, Southworth, J, Surdej, J, Tregloan-Reed, J, Vilela, C, Wertz, O, and Williams, A

Subjects
Settore FIS/05 - Astronomia e Astrofisica
Published
2016

3. MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: microlensing and a new time delay

Author

Giannini, E., primary, Schmidt, R. W., additional, Wambsganss, J., additional, Alsubai, K., additional, Andersen, J. M., additional, Anguita, T., additional, Bozza, V., additional, Bramich, D. M., additional, Browne, P., additional, Calchi Novati, S., additional, Damerdji, Y., additional, Diehl, C., additional, Dodds, P., additional, Dominik, M., additional, Elyiv, A., additional, Fang, X., additional, Figuera Jaimes, R., additional, Finet, F., additional, Gerner, T., additional, Gu, S., additional, Hardis, S., additional, Harpsøe, K., additional, Hinse, T. C., additional, Hornstrup, A., additional, Hundertmark, M., additional, Jessen-Hansen, J., additional, Jørgensen, U. G., additional, Juncher, D., additional, Kains, N., additional, Kerins, E., additional, Korhonen, H., additional, Liebig, C., additional, Lund, M. N., additional, Lundkvist, M. S., additional, Maier, G., additional, Mancini, L., additional, Masi, G., additional, Mathiasen, M., additional, Penny, M., additional, Proft, S., additional, Rabus, M., additional, Rahvar, S., additional, Ricci, D., additional, Scarpetta, G., additional, Sahu, K., additional, Schäfer, S., additional, Schönebeck, F., additional, Skottfelt, J., additional, Snodgrass, C., additional, Southworth, J., additional, Surdej, J., additional, Tregloan-Reed, J., additional, Vilela, C., additional, Wertz, O., additional, and Zimmer, F., additional

Published
2016
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4. Erratum: Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry (Astronomy and Astrophysics (2013) 555 (A36))

Author

Kains, N., Bramich, D., Arellano Ferro, A., Figuera Jaimes, R., Jørgensen, U., Giridhar, S., Penny, M., Alsubai, K., Andersen, J., Bozza, V., Browne, P., Burgdorf, M., Calchi Novati, S., Damerdji, Y., Diehl, C., Dodds, P., Dominik, M., Elyiv, A., Fang, X., Giannini, E., Gu, S., Hardis, S., Harpsøe, K., Hinse, T., Hornstrup, A., Hundertmark, M., Jessen-Hansen, J., Juncher, D., Kerins, E., Kjeldsen, H., Korhonen, H., Liebig, C., Lund, M., Lundkvist, M., Mancini, L., Martin, R., Mathiasen, M., Rabus, M., Rahvar, S., Ricci, D., Sahu, K., Scarpetta, G., Skottfelt, J., Snodgrass, C., Southworth, J., Surdej, J., Tregloan-Reed, J., Vilela, C., Wertz, O., Williams, Andrew, Kains, N., Bramich, D., Arellano Ferro, A., Figuera Jaimes, R., Jørgensen, U., Giridhar, S., Penny, M., Alsubai, K., Andersen, J., Bozza, V., Browne, P., Burgdorf, M., Calchi Novati, S., Damerdji, Y., Diehl, C., Dodds, P., Dominik, M., Elyiv, A., Fang, X., Giannini, E., Gu, S., Hardis, S., Harpsøe, K., Hinse, T., Hornstrup, A., Hundertmark, M., Jessen-Hansen, J., Juncher, D., Kerins, E., Kjeldsen, H., Korhonen, H., Liebig, C., Lund, M., Lundkvist, M., Mancini, L., Martin, R., Mathiasen, M., Rabus, M., Rahvar, S., Ricci, D., Sahu, K., Scarpetta, G., Skottfelt, J., Snodgrass, C., Southworth, J., Surdej, J., Tregloan-Reed, J., Vilela, C., Wertz, O., and Williams, Andrew

Published
2016

5. A much lower density for the transiting extrasolar planet WASP-7: (Research Note)

Author

Southworth, J, Dominik, M, Jorgensen, Ug, Rahvar, S, Snodgrass, C, Alsubai, K, Bozza, V, Browne, P, Burgdorf, M, Novati, Sc, Dodds, P, Dreizler, S, Finet, F, Gerner, T, Hardis, S, Harpsoe, K, Hellier, C, Hinse, Tc, Hundertmark, M, Kains, N, Kerins, E, Liebig, C, Mancini, L, Mathiasen, M, Penny, Mt, Proft, S, Ricci, D, Sahu, K, Scarpetta, G, Schafer, S, Schonebeck, F, and Surdej, J

Subjects
Settore FIS/05 - Astronomia e Astrofisica
Published
2011

6. A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251

Author

Kains, N., Street, R., Choi, J., Han, C., Udalski, A., Almeida, L., Jablonski, F., Tristram, P., Jorgensen, U., Szymanski, M., Kubiak, M., Pietrzynski, G., Soszynski, I., Poleski, R., Kozlowski, S., Pietrukowicz, P., Ulaczyk, K., Wyrzykowski, L., Skowron, J., Alsubai, K., Bozza, V., Browne, P., Burgdorf, M., Calchi Novati, S., Dodds, P., Dominik, M., Dreizler, S., Fang, X., Grundahl, F., Gu, C., Hardis, S., Harpsoe, K., Hessman, F., Hinse, T., Hornstrup, A., Hundertmark, M., Jessen-Hansen, J., Kerins, E., Liebig, C., Lund, M., Lundkvist, M., Mancini, L., Mathiasen, M., Penny, M., Rahvar, S., Ricci, D., Sahu, K., Scarpetta, G., Skottfelt, J., Snodgrass, C., Southworth, J., Surdej, J., Tregloan-Reed, J., Wambsganss, J., Wertz, O., Bajek, D., Bramich, D., Horne, K., Ipatov, S., Steele, I., Tsapras, Y., Abe, F., Bennett, D., Bond, I., Botzler, C., Chote, P., Freeman, M., Fukui, A., Furusawa, K., Itow, Y., Ling, C., Masuda, K., Matsubara, Y., Miyake, N., Muraki, Y., Ohnishi, K., Rattenbury, N., Saito, T., Sullivan, D., Sumi, T., Suzuki, D., Suzuki, K., Sweatman, W., Takino, S., Wada, K., Yock, P., Allen, W., Batista, V., Chung, S., Christie, G., DePoy, D., Drummond, J., Gaudi, B., Gould, A., Henderson, C., Jung, Y., Koo, J., Lee, C., McCormick, J., McGregor, D., Munoz, J., Natusch, T., Ngan, H., Park, H., Pogge, R., Shin, I., Yee, J., Albrow, M., Bachelet, E., Beaulieu, J., Brillant, S., Caldwell, J., Cassan, A., Cole, A., Corrales, E., Coutures, C., Dieters, S., Dominis Prester, D., Donatowicz, J., Fouque, P., Greenhill, J., Kane, S., Kubas, D., Marquette, J., Martin, R., Meintjes, P., Menzies, J., Pollard, K., Williams, Andrew, Wouters, D., Zub, M., Kains, N., Street, R., Choi, J., Han, C., Udalski, A., Almeida, L., Jablonski, F., Tristram, P., Jorgensen, U., Szymanski, M., Kubiak, M., Pietrzynski, G., Soszynski, I., Poleski, R., Kozlowski, S., Pietrukowicz, P., Ulaczyk, K., Wyrzykowski, L., Skowron, J., Alsubai, K., Bozza, V., Browne, P., Burgdorf, M., Calchi Novati, S., Dodds, P., Dominik, M., Dreizler, S., Fang, X., Grundahl, F., Gu, C., Hardis, S., Harpsoe, K., Hessman, F., Hinse, T., Hornstrup, A., Hundertmark, M., Jessen-Hansen, J., Kerins, E., Liebig, C., Lund, M., Lundkvist, M., Mancini, L., Mathiasen, M., Penny, M., Rahvar, S., Ricci, D., Sahu, K., Scarpetta, G., Skottfelt, J., Snodgrass, C., Southworth, J., Surdej, J., Tregloan-Reed, J., Wambsganss, J., Wertz, O., Bajek, D., Bramich, D., Horne, K., Ipatov, S., Steele, I., Tsapras, Y., Abe, F., Bennett, D., Bond, I., Botzler, C., Chote, P., Freeman, M., Fukui, A., Furusawa, K., Itow, Y., Ling, C., Masuda, K., Matsubara, Y., Miyake, N., Muraki, Y., Ohnishi, K., Rattenbury, N., Saito, T., Sullivan, D., Sumi, T., Suzuki, D., Suzuki, K., Sweatman, W., Takino, S., Wada, K., Yock, P., Allen, W., Batista, V., Chung, S., Christie, G., DePoy, D., Drummond, J., Gaudi, B., Gould, A., Henderson, C., Jung, Y., Koo, J., Lee, C., McCormick, J., McGregor, D., Munoz, J., Natusch, T., Ngan, H., Park, H., Pogge, R., Shin, I., Yee, J., Albrow, M., Bachelet, E., Beaulieu, J., Brillant, S., Caldwell, J., Cassan, A., Cole, A., Corrales, E., Coutures, C., Dieters, S., Dominis Prester, D., Donatowicz, J., Fouque, P., Greenhill, J., Kane, S., Kubas, D., Marquette, J., Martin, R., Meintjes, P., Menzies, J., Pollard, K., Williams, Andrew, Wouters, D., and Zub, M.

Abstract

Aims. We present the analysis of the gravitational microlensing event OGLE-2011-BLG-0251. This anomalous event was observed by several survey and follow-up collaborations conducting microlensing observations towards the Galactic bulge.Methods. Based on detailed modelling of the observed light curve, we find that the lens is composed of twomasses with a mass ratio q = 1.9 × 10-3. Thanks to our detection of higher-order effects on the light curve due to the Earth’s orbital motion and the finite size of source, we are able to measure the mass and distance to the lens unambiguously.Results. We find that the lens is made up of a planet of mass 0.53 ± 0.21 MJ orbiting an M dwarf host star with a mass of 0.26 ± 0.11 M. The planetary system is located at a distance of 2.57 ± 0.61 kpc towards the Galactic centre. The projected separation of the planet from its host star is d = 1.408 ± 0.019, in units of the Einstein radius, which corresponds to 2.72 ± 0.75 AU in physical units. We also identified a competitive model with similar planet and host star masses, but with a smaller orbital radius of 1.50 ± 0.50 AU. The planet is therefore located beyond the snow line of its host star, which we estimate to be around ~1-1.5 AU.

Published
2013

7. Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry

Author

Kains, N., Bramich, D., Arellano Ferro, A., Figuera Jaimes, R., Jørgensen, U., Giridhar, S., Penny, M., Alsubai, K., Andersen, J., Bozza, V., Browne, P., Burgdorf, M., Calchi Novati, S., Damerdji, Y., Diehl, C., Dodds, P., Dominik, M., Elyiv, A., Fang, X., Giannini, E., Gu, S., Hardis, S., Harpsoe, K., Hinse, T., Hornstrup, A., Hundertmark, M., Jessen-Hansen, J., Juncher, D., Kerins, E., Kjeldsen, H., Korhonen, H., Liebig, C., Lund, M., Lundkvist, M., Mancini, L., Martin, R., Mathiasen, M., Rabus, M., Rahvar, S., Ricci, D., Sahu, K., Scarpetta, G., Skottfelt, J., Snodgrass, C., Southworth, J., Surdej, J., Tregloan-Reed, J., Vilela, C., Wertz, O., Williams, Andrew, Kains, N., Bramich, D., Arellano Ferro, A., Figuera Jaimes, R., Jørgensen, U., Giridhar, S., Penny, M., Alsubai, K., Andersen, J., Bozza, V., Browne, P., Burgdorf, M., Calchi Novati, S., Damerdji, Y., Diehl, C., Dodds, P., Dominik, M., Elyiv, A., Fang, X., Giannini, E., Gu, S., Hardis, S., Harpsoe, K., Hinse, T., Hornstrup, A., Hundertmark, M., Jessen-Hansen, J., Juncher, D., Kerins, E., Kjeldsen, H., Korhonen, H., Liebig, C., Lund, M., Lundkvist, M., Mancini, L., Martin, R., Mathiasen, M., Rabus, M., Rahvar, S., Ricci, D., Sahu, K., Scarpetta, G., Skottfelt, J., Snodgrass, C., Southworth, J., Surdej, J., Tregloan-Reed, J., Vilela, C., Wertz, O., and Williams, Andrew

Abstract

Aims. We present the analysis of 26 nights of V and I time-series observations from 2011 and 2012 of the globular cluster M30 (NGC 7099). Weused our data to search for variable stars in this cluster and refine the periods of known variables; we then used our variable star light curves toderive values for the cluster’s parameters.Methods. We used difference image analysis to reduce our data to obtain high-precision light curves of variable stars.We then estimated the clusterparameters by performing a Fourier decomposition of the light curves of RR Lyrae stars for which a good period estimate was possible. We alsoderived an estimate for the age of the cluster by fitting theoretical isochrones to our colour-magnitude diagram (CMD).Results. Out of 13 stars previously catalogued as variables, we find that only 4 are bona fide variables. We detect two new RR Lyrae variables,and confirm two additional RR Lyrae candidates from the literature. We also detect four other new variables, including an eclipsing blue stragglersystem, and an SX Phoenicis star. This amounts to a total number of confirmed variable stars in M30 of 12. We perform Fourier decomposition ofthe light curves of the RR Lyrae stars to derive cluster parameters using empirical relations.We find a cluster metallicity [Fe/H]ZW = -2.01±0.04,or [Fe/H]UVES = -2.11 ± 0.06, and a distance of 8.32 ± 0.20 kpc (using RR0 variables), 8.10 kpc (using one RR1 variable), and 8.35 ± 0.42 kpc(using our SX Phoenicis star detection in M30). Fitting isochrones to the CMD, we estimate an age of 13.0 ± 1.0 Gyr for M30.

Published
2013

8. A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251

Author

Kains, N., primary, Street, R. A., additional, Choi, J.-Y., additional, Han, C., additional, Udalski, A., additional, Almeida, L. A., additional, Jablonski, F., additional, Tristram, P. J., additional, Jørgensen, U. G., additional, Szymański, M. K., additional, Kubiak, M., additional, Pietrzyński, G., additional, Soszyński, I., additional, Poleski, R., additional, Kozłowski, S., additional, Pietrukowicz, P., additional, Ulaczyk, K., additional, Wyrzykowski, Ł., additional, Skowron, J., additional, Alsubai, K. A., additional, Bozza, V., additional, Browne, P., additional, Burgdorf, M. J., additional, Calchi Novati, S., additional, Dodds, P., additional, Dominik, M., additional, Dreizler, S., additional, Fang, X.-S., additional, Grundahl, F., additional, Gu, C.-H., additional, Hardis, S., additional, Harpsøe, K., additional, Hessman, F. V., additional, Hinse, T. C., additional, Hornstrup, A., additional, Hundertmark, M., additional, Jessen-Hansen, J., additional, Kerins, E., additional, Liebig, C., additional, Lund, M., additional, Lundkvist, M., additional, Mancini, L., additional, Mathiasen, M., additional, Penny, M. T., additional, Rahvar, S., additional, Ricci, D., additional, Sahu, K. C., additional, Scarpetta, G., additional, Skottfelt, J., additional, Snodgrass, C., additional, Southworth, J., additional, Surdej, J., additional, Tregloan-Reed, J., additional, Wambsganss, J., additional, Wertz, O., additional, Bajek, D., additional, Bramich, D. M., additional, Horne, K., additional, Ipatov, S., additional, Steele, I. A., additional, Tsapras, Y., additional, Abe, F., additional, Bennett, D. P., additional, Bond, I. A., additional, Botzler, C. S., additional, Chote, P., additional, Freeman, M., additional, Fukui, A., additional, Furusawa, K., additional, Itow, Y., additional, Ling, C. H., additional, Masuda, K., additional, Matsubara, Y., additional, Miyake, N., additional, Muraki, Y., additional, Ohnishi, K., additional, Rattenbury, N., additional, Saito, T., additional, Sullivan, D. J., additional, Sumi, T., additional, Suzuki, D., additional, Suzuki, K., additional, Sweatman, W. L., additional, Takino, S., additional, Wada, K., additional, Yock, P. C. M., additional, Allen, W., additional, Batista, V., additional, Chung, S.-J., additional, Christie, G., additional, DePoy, D. L., additional, Drummond, J., additional, Gaudi, B. S., additional, Gould, A., additional, Henderson, C., additional, Jung, Y.-K., additional, Koo, J.-R., additional, Lee, C.-U., additional, McCormick, J., additional, McGregor, D., additional, Muñoz, J. A., additional, Natusch, T., additional, Ngan, H., additional, Park, H., additional, Pogge, R. W., additional, Shin, I.-G., additional, Yee, J., additional, Albrow, M. D., additional, Bachelet, E., additional, Beaulieu, J.-P., additional, Brillant, S., additional, Caldwell, J. A. R., additional, Cassan, A., additional, Cole, A., additional, Corrales, E., additional, Coutures, Ch., additional, Dieters, S., additional, Dominis Prester, D., additional, Donatowicz, J., additional, Fouqué, P., additional, Greenhill, J., additional, Kane, S. R., additional, Kubas, D., additional, Marquette, J.-B., additional, Martin, R., additional, Meintjes, P., additional, Menzies, J., additional, Pollard, K. R., additional, Williams, A., additional, Wouters, D., additional, and Zub, M., additional

Published
2013
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9. Flux and color variations of the doubly imaged quasar UM673

Author

Ricci, D., primary, Elyiv, A., additional, Finet, F., additional, Wertz, O., additional, Alsubai, K., additional, Anguita, T., additional, Bozza, V., additional, Browne, P., additional, Burgdorf, M., additional, Calchi Novati, S., additional, Dodds, P., additional, Dominik, M., additional, Dreizler, S., additional, Gerner, T., additional, Glitrup, M., additional, Grundahl, F., additional, Hardis, S., additional, Harpsøe, K., additional, Hinse, T. C., additional, Hornstrup, A., additional, Hundertmark, M., additional, Jørgensen, U. G., additional, Kains, N., additional, Kerins, E., additional, Liebig, C., additional, Maier, G., additional, Mancini, L., additional, Masi, G., additional, Mathiasen, M., additional, Penny, M., additional, Proft, S., additional, Rahvar, S., additional, Scarpetta, G., additional, Sahu, K., additional, Schäfer, S., additional, Schönebeck, F., additional, Schmidt, R., additional, Skottfelt, J., additional, Snodgrass, C., additional, Southworth, J., additional, Thöne, C. C., additional, Wambsganss, J., additional, Zimmer, F., additional, Zub, M., additional, and Surdej, J., additional

Published
2013
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10. The transiting system GJ1214: high-precision defocused transit observations and a search for evidence of transit timing variation

Author

Harpsøe, K. B. W., primary, Hardis, S., additional, Hinse, T. C., additional, Jørgensen, U. G., additional, Mancini, L., additional, Southworth, J., additional, Alsubai, K. A., additional, Bozza, V., additional, Browne, P., additional, Burgdorf, M. J., additional, Calchi Novati, S., additional, Dodds, P., additional, Dominik, M., additional, Fang, X.-S., additional, Finet, F., additional, Gerner, T., additional, Gu, S.-H., additional, Hundertmark, M., additional, Jessen-Hansen, J., additional, Kains, N., additional, Kerins, E., additional, Kjeldsen, H., additional, Liebig, C., additional, Lund, M. N., additional, Lundkvist, M., additional, Mathiasen, M., additional, Nesvorný, D., additional, Nikolov, N., additional, Penny, M. T., additional, Proft, S., additional, Rahvar, S., additional, Ricci, D., additional, Sahu, K. C., additional, Scarpetta, G., additional, Schäfer, S., additional, Schönebeck, F., additional, Snodgrass, C., additional, Skottfelt, J., additional, Surdej, J., additional, Tregloan-Reed, J., additional, and Wertz, O., additional

Published
2012
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11. Flux and color variations of the quadruply imaged quasar HE 0435-1223

Author

Ricci, D., primary, Poels, J., additional, Elyiv, A., additional, Finet, F., additional, Sprimont, P. G., additional, Anguita, T., additional, Bozza, V., additional, Browne, P., additional, Burgdorf, M., additional, Calchi Novati, S., additional, Dominik, M., additional, Dreizler, S., additional, Glitrup, M., additional, Grundahl, F., additional, Harpsøe, K., additional, Hessman, F., additional, Hinse, T. C., additional, Hornstrup, A., additional, Hundertmark, M., additional, Jørgensen, U. G., additional, Liebig, C., additional, Maier, G., additional, Mancini, L., additional, Masi, G., additional, Mathiasen, M., additional, Rahvar, S., additional, Scarpetta, G., additional, Skottfelt, J., additional, Snodgrass, C., additional, Southworth, J., additional, Teuber, J., additional, Thöne, C. C., additional, Wambsganß, J., additional, Zimmer, F., additional, Zub, M., additional, and Surdej, J., additional

Published
2011
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12. A much lower density for the transiting extrasolar planet WASP-7

Author

Southworth, J., primary, Dominik, M., additional, Jørgensen, U. G., additional, Rahvar, S., additional, Snodgrass, C., additional, Alsubai, K., additional, Bozza, V., additional, Browne, P., additional, Burgdorf, M., additional, Calchi Novati, S., additional, Dodds, P., additional, Dreizler, S., additional, Finet, F., additional, Gerner, T., additional, Hardis, S., additional, Harpsøe, K., additional, Hellier, C., additional, Hinse, T. C., additional, Hundertmark, M., additional, Kains, N., additional, Kerins, E., additional, Liebig, C., additional, Mancini, L., additional, Mathiasen, M., additional, Penny, M. T., additional, Proft, S., additional, Ricci, D., additional, Sahu, K., additional, Scarpetta, G., additional, Schäfer, S., additional, Schönebeck, F., additional, and Surdej, J., additional

Published
2011
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13. A brown dwarf orbiting an M-dwarf: MOA 2009-BLG-411L.

Author

Bachelet, E., Fouqué, P., Han, C., Gould, A., Albrow, M. D., Beaulieu, J.-P., Bertin, E., Bond, I. A., Christie, G. W., Heyrovský, D., Horne, K., Jørgensen, U. G., Maoz, D., Mathiasen, M., Matsunaga, N., McCormick, J., Menzies, J., Nataf, D., Natusch, T., and Oi, N.

Subjects
DWARF stars, CAUSTICS (Optics), GIANT stars, INTERSTELLAR medium, ASTRONOMY, ASTROPHYSICS
Abstract

Context. Caustic crossing is the clearest signature of binary lenses in microlensing. In the present context, this signature is diluted by the large source star but a detailed analysis has allowed the companion signal to be extracted. Aims. MOA 2009-BLG-411 was detected on August 5, 2009 by the MOA-Collaboration. Alerted as a high-magnification event, it was sensitive to planets. Suspected anomalies in the light curve were not confirmed by a real-time model, but further analysis revealed small deviations from a single lens extended source fit. Methods. Thanks to observations by all the collaborations, this event was well monitored. We first decided to characterize the source star properties by using a more refined method than the classical one: we measure the interstellar absorption along the line of sight in five different passbands (VIJHK). Secondly, we model the lightcurve by using the standard technique: make (s, q, α) grids to look for local minima and refine the results by using a downhill method (Markov chain Monte Carlo). Finally, we use a Galactic model to estimate the physical properties of the lens components. Results. We find that the source star is a giant G star with radius 9 R☉. The grid search gives two local minima, which correspond to the theoretical degeneracy s ≡ s-1. We find that the lens is composed of a brown dwarf secondary of mass MS = 0.05 M☉ orbiting a primary M-star of mass MP = 0.18 M☉. We also reveal a new mass-ratio degeneracy for the central caustics of close binaries. Conclusions. As far as we are aware, this is the first detection using the microlensing technique of a binary system in our Galaxy composed of an M-star and a brown dwarf [ABSTRACT FROM AUTHOR]

Published
2012
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