Imperial College London

DrYvonneUnruh

Faculty of Natural SciencesDepartment of Physics

Reader in Astrophysics
 
 
 
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Contact

 

y.unruh Website

 
 
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Location

 

1114Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

64 results found

Norris CM, Beeck B, Unruh YC, Solanki SK, Krivova NA, Yeo KLet al., Spectral variability of photospheric radiation due to faculae. I. The Sun and Sun-like stars, Astronomy & Astrophysics, ISSN: 0004-6361

JOURNAL ARTICLE

Yeo KL, Solanki SK, Norris CM, Beeck B, Unruh YC, Krivova NAet al., 2017, Solar Irradiance Variability is Caused by the Magnetic Activity on the Solar Surface, PHYSICAL REVIEW LETTERS, Vol: 119, ISSN: 0031-9007

JOURNAL ARTICLE

Chadney JM, Galand M, Koskinen TT, Miller S, Sanz-Forcada J, Unruh YC, Yelle RVet al., 2016, EUV-driven ionospheres and electron transport on extrasolar giant planets orbiting active stars, ASTRONOMY & ASTROPHYSICS, Vol: 587, ISSN: 1432-0746

JOURNAL ARTICLE

Dasi-Espuig M, Jiang J, Krivova NA, Solanki SK, Unruh YC, Yeo KLet al., 2016, Reconstruction of spectral solar irradiance since 1700 from simulated magnetograms, ASTRONOMY & ASTROPHYSICS, Vol: 590, ISSN: 1432-0746

JOURNAL ARTICLE

Haywood RD, Cameron AC, Unruh YC, Lovis C, Lanza AF, Llama J, Deleuil M, Fares R, Gillon M, Moutou C, Pepe F, Pollacco D, Queloz D, Segransan Det al., 2016, The Sun as a planet-host star: proxies from SDO images for HARPS radial-velocity variations, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 457, Pages: 3637-3651, ISSN: 0035-8711

JOURNAL ARTICLE

Chadney JM, Galand M, Unruh YC, Koskinen TT, Sanz-Forcada Jet al., 2015, XUV-driven mass loss from extrasolar giant planets orbiting active stars, ICARUS, Vol: 250, Pages: 357-367, ISSN: 0019-1035

JOURNAL ARTICLE

Kalari VM, Vink JS, Drew JE, Barentsen G, Drake JJ, Eisloeffel J, Martin EL, Parker QA, Unruh YC, Walton NA, Wright NJet al., 2015, Classical T Tauri stars with VPHAS plus - I. H alpha and u-band accretion rates in the Lagoon Nebula M8, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 453, Pages: 1026-1046, ISSN: 0035-8711

JOURNAL ARTICLE

Mohr-Smith M, Drew JE, Barentsen G, Wright NJ, Napiwotzki R, Corradi RLM, Eisloeffel J, Groot P, Kalari V, Parker QA, Raddi R, Sale SE, Unruh YC, Vink JS, Wesson Ret al., 2015, New OB star candidates in the Carina Arm around Westerlund 2 from VPHAS, Monthly Notices of the Royal Astronomical Society, Vol: 450, Pages: 3855-3873, ISSN: 1365-2966

O and early B stars are at the apex of galactic ecology, but in the Milky Way, only a minority of them may yet have been identified. We present the results of a pilot study to select and parametrize OB star candidates in the Southern Galactic plane, down to a limiting magnitude of g = 20. A 2 deg2 field capturing the Carina Arm around the young massive star cluster, Westerlund 2, is examined. The confirmed OB stars in this cluster are used to validate our identification method, based on selection from the (u − g, g − r) diagram for the region. Our Markov Chain Monte Carlo fitting method combines VPHAS+ u, g, r, i with published J, H, K photometry in order to derive posterior probability distributions of the stellar parameters log (Teff) and distance modulus, together with the reddening parameters A0 and RV. The stellar parameters are sufficient to confirm OB status while the reddening parameters are determined to a precision of σ(A0) ∼ 0.09 and σ(RV) ∼ 0.08. There are 489 objects that fit well as new OB candidates, earlier than ∼B2. This total includes 74 probable massive O stars, 5 likely blue supergiants and 32 reddened subdwarfs. This increases the number of previously known and candidate OB stars in the region by nearly a factor of 10. Most of the new objects are likely to be at distances between 3 and 6 kpc. We have confirmed the results of previous studies that, at these longer distances, these sight lines require non-standard reddening laws with 3.5 < RV < 4.

JOURNAL ARTICLE

Yeo KL, Ball WT, Krivova NA, Solanki SK, Unruh YC, Morrill Jet al., 2015, UV solar irradiance in observations and the NRLSSI and SATIRE-S models, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 120, Pages: 6055-6070, ISSN: 2169-9380

JOURNAL ARTICLE

Ball WT, Krivova NA, Unruh YC, Haigh JD, Solanki SKet al., 2014, A New SATIRE-S Spectral Solar Irradiance Reconstruction for Solar Cycles 21-23 and Its Implications for Stratospheric Ozone, JOURNAL OF THE ATMOSPHERIC SCIENCES, Vol: 71, Pages: 4086-4101, ISSN: 0022-4928

JOURNAL ARTICLE

Barentsen G, Farnhill HJ, Drew JE, Gonzalez-Solares EA, Greimel R, Irwin MJ, Miszalski B, Ruhland C, Groot P, Mampaso A, Sale SE, Henden AA, Aungwerojwit A, Barlow MJ, Carter PJ, Corradi RLM, Drake JJ, Eisloeffel J, Fabregat J, Gaensicke BT, Fusillo NPG, Greiss S, Hales AS, Hodgkin S, Huckvale L, Irwin J, King R, Knigge C, Kupfer T, Lagadec E, Lennon DJ, Lewis JR, Mohr-Smith M, Morris RAH, Naylor T, Parker QA, Phillipps S, Pyrzas S, Raddi R, Roelofs GHA, Rodriguez-Gil P, Sabin L, Scaringi S, Steeghs D, Suso J, Tata R, Unruh YC, van Roestel J, Viironen K, Vink JS, Walton NA, Wright NJ, Zijlstra AAet al., 2014, The second data release of the INT Photometric Ha Survey of the Northern Galactic Plane (IPHAS DR2), MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 444, Pages: 3230-3257, ISSN: 0035-8711

JOURNAL ARTICLE

Drew JE, Gonzalez-Solares E, Greimel R, Irwin MJ, Yoldas AK, Lewis J, Barentsen G, Eisloeffel J, Farnhill HJ, Martin WE, Walsh JR, Walton NA, Mohr-Smith M, Raddi R, Sale SE, Wright NJ, Groot P, Barlow MJ, Corradi RLM, Drake JJ, Fabregat J, Frew DJ, Gaensicke BT, Knigge C, Mampaso A, Morris RAH, Naylor T, Parker QA, Phillipps S, Ruhland C, Steeghs D, Unruh YC, Vink JS, Wesson R, Zijlstra AAet al., 2014, The VST Photometric H alpha Survey of the Southern Galactic Plane and Bulge (VPHAS plus ), MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 440, Pages: 2036-2058, ISSN: 0035-8711

JOURNAL ARTICLE

Haywood RD, Cameron AC, Queloz D, Barros SCC, Deleuil M, Fares R, Gillon M, Hatzes A, Lanza AF, Lovis C, Moutou C, Pepe F, Pollacco D, Santerne A, Segransan D, Unruh Yet al., 2014, Disentangling planetary orbits from stellar activity in radial-velocity surveys, INTERNATIONAL JOURNAL OF ASTROBIOLOGY, Vol: 13, Pages: 155-157, ISSN: 1473-5504

JOURNAL ARTICLE

Haywood RD, Cameron AC, Queloz D, Barros SCC, Deleuil M, Fares R, Gillon M, Lanza AF, Lovis C, Moutou C, Pepe F, Pollacco D, Santerne A, Segransan D, Unruh YCet al., 2014, Planets and stellar activity: hide and seek in the CoRoT-7 system, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 443, Pages: 2517-2531, ISSN: 0035-8711

JOURNAL ARTICLE

Shapiro AI, Solanki SK, Krivova NA, Schmutz WK, Ball WT, Knaack R, Rozanov EV, Unruh YCet al., 2014, Variability of Sun-like stars: reproducing observed photometric trends, ASTRONOMY & ASTROPHYSICS, Vol: 569, ISSN: 0004-6361

JOURNAL ARTICLE

Dhomse SS, Chipperfield MP, Feng W, Ball WT, Unruh YC, Haigh JD, Krivova NA, Solanki SK, Smith AKet al., 2013, Stratospheric O-3 changes during 2001-2010: the small role of solar flux variations in a chemical transport model, ATMOSPHERIC CHEMISTRY AND PHYSICS, Vol: 13, Pages: 10113-10123, ISSN: 1680-7316

JOURNAL ARTICLE

Ermolli I, Matthes K, de Wit TD, Krivova NA, Tourpali K, Weber M, Unruh YC, Gray L, Langematz U, Pilewskie P, Rozanov E, Schmutz W, Shapiro A, Solanki SK, Woods TNet al., 2013, Recent variability of the solar spectral irradiance and its impact on climate modelling, ATMOSPHERIC CHEMISTRY AND PHYSICS, Vol: 13, Pages: 3945-3977, ISSN: 1680-7316

JOURNAL ARTICLE

Solanki SK, Unruh YC, 2013, Solar irradiance variability, ASTRONOMISCHE NACHRICHTEN, Vol: 334, Pages: 145-150, ISSN: 0004-6337

JOURNAL ARTICLE

Ball WT, Unruh YC, Krivova NA, Solanki S, Wenzler T, Mortlock DJ, Jaffe AHet al., 2012, Reconstruction of total solar irradiance 1974-2009, ASTRONOMY & ASTROPHYSICS, Vol: 541, ISSN: 1432-0746

JOURNAL ARTICLE

Unruh YC, Ball WT, Krivova NA, 2012, Solar Irradiance Models and Measurements: A Comparison in the 220-240 nm wavelength band, SURVEYS IN GEOPHYSICS, Vol: 33, Pages: 475-481, ISSN: 0169-3298

JOURNAL ARTICLE

Afram N, Unruh YC, Solanki SK, Schuessler M, Lagg A, Vogler Aet al., 2011, Intensity contrast from MHD simulations and HINODE observations, ASTRONOMY & ASTROPHYSICS, Vol: 526, ISSN: 0004-6361

JOURNAL ARTICLE

Ball WT, Unruh YC, Krivova NA, Solanki S, Harder JWet al., 2011, Solar irradiance variability: a six-year comparison between SORCE observations and the SATIRE model, ASTRONOMY & ASTROPHYSICS, Vol: 530, ISSN: 0004-6361

JOURNAL ARTICLE

Donati J-F, Gregory SG, Alencar SHP, Bouvier J, Hussain G, Skelly M, Dougados C, Jardine MM, Menard F, Romanova MM, Unruh YCet al., 2011, The large-scale magnetic field and poleward mass accretion of the classical T Tauri star TW Hya, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 417, Pages: 472-487, ISSN: 0035-8711

JOURNAL ARTICLE

Krivova NA, Solanki SK, Unruh YC, 2011, Towards a long-term record of solar total and spectral irradiance, JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, Vol: 73, Pages: 223-234, ISSN: 1364-6826

JOURNAL ARTICLE

Afram N, Unruh YC, Solanki SK, Schuessler M, Mathew SKet al., 2010, A comparison of measured and simulated solar network contrast, 264th Symposium of the International-Astronomical-Union, Publisher: CAMBRIDGE UNIV PRESS, Pages: 63-65, ISSN: 1743-9213

CONFERENCE PAPER

Corradi RLM, Valentini M, Munari U, Drew JE, Rodriguez-Flores ER, Viironen K, Greimel R, Santander-Garcia M, Sabin L, Mampaso A, Parker Q, De Pew K, Sale SE, Unruh YC, Vink JS, Rodriguez-Gil P, Barlow MJ, Lennon DJ, Groot PJ, Giammanco C, Zijlstra AA, Walton NAet al., 2010, IPHAS and the symbiotic stars II. New discoveries and a sample of the most common mimics, ASTRONOMY & ASTROPHYSICS, Vol: 509, ISSN: 0004-6361

JOURNAL ARTICLE

Donati J-F, Skelly MB, Bouvier J, Gregory SG, Grankin KN, Jardine MM, Hussain GAJ, Menard F, Dougados C, Unruh Y, Mohanty S, Auriere M, Morin J, Fares Ret al., 2010, Magnetospheric accretion and spin-down of the prototypical classical T Tauri star AA Tau, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 409, Pages: 1347-1361, ISSN: 0035-8711

JOURNAL ARTICLE

Donati J-F, Skelly MB, Bouvier J, Jardine MM, Gregory SG, Morin J, Hussain GAJ, Dougados C, Menard F, Unruh Yet al., 2010, Complex magnetic topology and strong differential rotation on the low-mass T Tauri star V2247 Oph star, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 402, Pages: 1426-1436, ISSN: 0035-8711

JOURNAL ARTICLE

Hirzberger J, Feller A, Riethmueller TL, Schuessler M, Borrero JM, Afram N, Unruh YC, Berdyugina SV, Gandorfer A, Solanki SK, Barthol P, Bonet JA, Martinez Pillet V, Berkefeld T, Knoelker M, Schmidt W, Title AMet al., 2010, QUIET-SUN INTENSITY CONTRASTS IN THE NEAR-ULTRAVIOLET AS MEASURED FROM SUNRISE, ASTROPHYSICAL JOURNAL LETTERS, Vol: 723, Pages: L154-L158, ISSN: 2041-8205

JOURNAL ARTICLE

Sale SE, Drew JE, Knigge C, Zijlstra AA, Irwin MJ, Morris RAH, Phillipps S, Drake JJ, Greimel R, Unruh YC, Groot PJ, Mampaso A, Walton NAet al., 2010, The structure of the outer Galactic disc as revealed by IPHAS early A stars, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 402, Pages: 713-723, ISSN: 0035-8711

JOURNAL ARTICLE

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