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Dr. Arvind Singh

Astronomy and Astrophysics
Physical Research Laboratory
Unit of Dept. of Space, Govt. of India
Navrangpura, Ahmedabad-380 009
E-mail: [email protected]
Telephone: +91-79-26314602
> My CV

Research Interests

  • Fundamental physical properties of M dwarfs
  • Atmosphere modelling of very low mass stars and brown dwarfs
  • Magnetic activity in M dwarfs

Academic Qualifications

Professional Experience

Publications

  • NASA ADS
  • Google Scholar
  • Research Gate
    1. Rajpurohit, A. S. ,"White-Light Flare in Wolf 424: Simultaneous Spectroscopy and Photometry"
    2. K. Rajpurohit, A. Botteon, E. O'Sullivan, W. Forman, M. Balboni, L. Bruno, R. J. van Weeren, M. Hoeft, G. Brunetti, C. Jones, A. S. Rajpurohit, S. P. Sikhosana, "Radial Profiles of Radio Halos in Massive Galaxy Clusters: Diffuse Giants Over 2 Mpc", 2025ApJ...992...88R
    3. Rajpurohit, A. S. , Kumar, V., Mudit, K. Srivastava,Labadie, L., Fernández-Trincado, J. G., "Exploring Stellar Activity in a Sample of Active M Dwarfs", accepted for publication in A&A
    4. Salome Grouffal, Alexandre Santerne, Vincent Bourrier, Vedad Kunovac, Courtney Dressing, Babatunde Akinsanmi, David Armstrong, Sanjay Baliwal, Olga Balsalobre-Ruza, Susana C.C. Barros, Daniel Bayliss, Ian J.M. Crossfield, Olivier Demangeon, Xavier Dumusque, Steven Giacalone, Caleb K. Harada, Howard Isaacson, Hanna Kellermann, Jorge Lillo-Box, Joe Llama, Annelies Mortier, Enric Palle, A. S. Rajpurohit, Malena Rice, Nuno C. Santos, Julia V. Seidel, Rishikesh Sharma, Sergio G. Sousa, Luis Thomas, Emma V. Turtelboom, Stephane Udry, Peter J. Wheatley, "The star HIP 41378 potentially misaligned with its cohort of long-period planets", A&A, 701, A173 (2025)
    5. N. Schanche, G. Hébrard, K.G. Stassun, B. Hord, K. Barkaoui, A. Bieryla, D. Ciardi, K.A. Collins, A. Collier Cameron, J. Hartman, N. Heidari, C. Hellier, S.B. Howell, M. Lendl, J. McCormac, K.K. McLeod, H. Parviainen, D. Radford, A. S. Rajpurohit, H. Relles, R. Sharma, S. Baliwal, F. Bouchy, A. Burdanov, P.A. Budnikova, A. Chakaraborty, C. Clark, , L. Delrez, J. Donnenfield, M. Gillon, C. Hedges, E. Jehin, J. Jenkins, D. Laloum , M. Lund, P. Magain, P. Maxted, K.J. Nikitha, C. Opitom, M. Rose, S.G. Sousa, I.A. Strakhov, P. Strøm, A. Tuson, J. Winn, "A Swarm of WASP Planets: Nine new giant planets identified by the WASP survey", 2025AJ....169..334S
    6. W. J. Cooper, H. R. A. Jones, R. L. Smart, S. L. Folkes, J. A. Caballero, F. Marocco, M. C. Gálvez Orti, A. J. Burgasser, J. Davy. Kirkpatrick, L. M. Sarro B. Burningham, A. Cabrera Lavers, P. E. Tremblay, C. Reyle, Nicolas. Lodieu, Z. H. Zhang, N. J. Cook, J. F. Faherty, D. Garcí-Alvarez,D. Monte D. J. Pinfield, A. S. Rajpurohit, J. Shi, "The Gaia Ultra Cool Dwarf Sample-IV. GTC/OSIRIS optical spectra of Gaia L dwarfs", 2024MNRAS.534..695C
    7. Vipin Kumar, A. S. Rajpurohit, Mudit K Srivastava, Jose G. Fernandez-Trincado,Queiroz, A. B. A., "Exploring the short term variabilities of H-alpha and H-beta emission in a sample of M dwarfs, 2023MNRAS.524.6085K
    8. Rajpurohit, K. ; Osinga, E. ; Brienza, M. ; Botteon, A. ; Brunetti, G. ; Forman, W. R. ; Riseley, C. J. ; Vazza, F. ; Bonafede, A. ; van Weeren, R. J. ; Brüggen, M. ; Rajpurohit, S. ; Drabent, A. ; Dallacasa, D. ; Rossetti, M. Rajpurohit, A. S. ; Hoeft, M. ; Bonnassieux, E. ; Cassano, R. ; Miley, G. K., "Deep low-frequency radio observations of Abell 2256 II: The ultra-steep spectrum radio halo", 2023A&A...669A...1R
    9. Rajpurohit, K.; van Weeren, R. J.; Hoeft, M. ; Vazza, F.; Brienza, M.; Forman, W.; Wittor, D.; Domínguez-Fernández, ; Rajpurohit, S. ; Riseley, C. J. ; Botteon, A.; Osinga, E.; Brunetti, G. ; Bonnassieux, E. ; Bonafede, A.; Rajpurohit, A. S.; Stuardi, C.; Drabent, A.; Brüggen, M.; Dallacasa, D. ; Shimwell, T. W.; Röttgering, H. J. .; Gasperin, F. de ; Miley, G. K. ; Rossetti, M., "Deep Low-frequency Radio Observations of A2256. I. The Filamentary Radio Relic", 2022ApJ...927...80R
    10. Rajpurohit, K. ; Hoeft, M. ; Wittor, D. ; van Weeren, R. J. ; Vazza, F. ; Rudnick, L. ; Forman, W. R. ; Riseley, C. J. ; Brienza, M. ; Bonafede, A. ;Rajpurohit, A. S. ; Domínguez-Fernández, P. ; Rajpurohit, S. ; Eilek, J. ; Bonnassieux, E. ; Brüggen, M. ; Loi, F. ; Röttgering, H. J. A. ; Drabent, A. ; Locatelli, "Turbulent magnetic fields in the merging galaxy cluster MACS J0717.5+3745: polarization analysis" , 2022A&A...657A...2R
    11. Srivastava, Mudit K.; Kumar, Vipin; Dixit, Vaibhav; Patel, Ankita; Jangra, Mohanlal; Rajpurohit, A. S.; Mathur, S. N, "Design and development of Mt.Abu faint object spectrograph and camera- Pathfinder (MFOSC-P) for PRL 1.2m Mt. Abu Telescope" , 2021ExA...tmp...45S
    12. Rajpurohit, K. ; Vazza, F. ; van Weeren, R. J. ; Hoeft, M. ; Brienza, M. ; Bonnassieux, E. ; Riseley, C. J. ; Brunetti, G. ; Bonafede, A. ; Brüggen, M. ; Formann, W. R. ; Rajpurohit, A. S.; Röttgering, H. J. A. ; Drabent, A. ; Domínguez-Fernández, P. ; Wittor, D. ; Andrade-Santos, F., "Dissecting nonthermal emission in the complex multiple-merger galaxy cluster Abell 2744: Radio and X-ray analysis " , 2021A&A...654A..41R
    13. K. Rajpurohit, G. Brunetti, A. Bonafede, R. J. van Weeren, A. Botteon, F. Vazza, M. Hoeft, C. J. Riseley, E. Bonnassieux, M. Brienza, W. R. Forman, H. J. A. Rottgering, N. Locatelli, A. S. Rajpurohit, T. W. Shimwell, R. Cassano, G. Di Gennaro, M. Bruggen, D. Wittor, A. Drabent, and A. Ignesti, "Physical insights from the spectrum of the radio halo in MACS J0717.5+3745" , 2021A&A...646A.135R
    14. K. Rajpurohit, D. Wittor, R. J. van Weeren, F. Vazza, M. Hoeft, L. Rudnick, N. Locatelli, J. Eilek, A. Bonafede, E. Bonnassieux, W. R. Forman, C. J. Riseley, M. Brienza, G. Brunetti, M. Bruggen, F. Loi, A. S. Rajpurohit, H. J. A. Rottgering, A. Botteon, T. E. Clarke, A. Drabent, P. Dominguez-Fernandez, G. Di Gennaro, and F. Gastaldello, "Understanding the radio relic emission in the galaxy cluster MACS J0717.5+3745: spectral analysis" , 2021A&A...646A..56R
    15. A. S. Rajpurohit, F. Allard, D. Homeier, O. Mousis, S. Rajpurohit, "A dayside thermal inversion in the atmosphere of WASP-19b" , 2020, A&A 642, A39
    16. Subhajeet Karmakar, A. S. Rajpurohit, F. Allard, D. Homeier, "Detection and characterisation of two VLM binaries: LP 1033-31 and LP 877-72", 2020, MNRAS.498..737K
    17. A. S. Rajpurohit, Vipin Kumar, Mudit K. Srivastava, F. Allard, D. Homeier, Vaibhav Dixit and Ankita Patel, First results from MFOSC-P: low-resolution optical spectroscopy of a sample of M dwarfs within 100 parsecs, 2020, MNRAS, 492, 5844-5852
    18. A. S. Rajpurohit, F. Allard, S. Rajpurohit, R. Sharma, G. D. C. Teixeira, O. Mousis, R. Kamlesh, "Exploring the stellar properties of M Dwarfs with High-resolution spectroscopy from the Optical to the Near-Infrared", 2018, A&A...620A.180R
    19. Fouqué, Pascal; Moutou, Claire; Malo, Lison; Martioli, Eder; Lim, Olivia; Rajpurohit, Arvind; Artigau, Etienne; Delfosse, Xavier; Donati, Jean-François; Forveille, Thierry; Morin, Julien; Allard, France; Delage, Raphaël; Doyon, René; Hébrard, Elodie; Neves, Vasco, SPIRou Input Catalogue: Global properties of 440 M dwarfs observed with ESPaDOnS at CHT, 2018, MNRAS.475.1960F
    20. A. S. Rajpurohit, F. Allard, G. D. C. Teixeira, D. Homeier, S. Rajpurohit, O. Mousis, Photospheric properties and fundamental parameters of M dwarfs, A&A 610, A19 (2018)
    21. Bayo, A.; Barrado, D.; Allard, F.; Henning, T.; Comerón, F.; Morales-Calderón, M.; Rajpurohit, A. S.; Peña Ramírez, K.; Beamín, J. C., Physical parameters of late M-type members of Chamaeleon I and TW Hydrae Association: dust settling, age dispersion and activity, 2017MNRAS.465..760B
    22. Rajpurohit, A. S.; Reylé, C.; Allard, F.; Homeier, D.; Bayo, A.; Mousis, O.; Rajpurohit, S.; Fernández-Trincado, J. G., Spectral energy distribution of M-subdwarfs: A study of their atmospheric properties, 2016A&A...596A..33R
    23. Lillo-Box, J.; Demangeon, O.; Santerne, A.; Barros, S. C. C.; Barrado, D.; Hébrard, G.;... Rajpurohit, A.; Rey, J.; Santos, N. C.; Sousa, S. G.; Tsantaki, M.; Wilson, P. A., K2-30 b and K2-34 b: Two inflated hot Jupiters around solar-type stars , 2016A&A...594A..50L
    24. Santerne, A.; Hébrard, G.; Lillo-Box, J.; Armstrong, D. J.; Barros, S. C. C.; Demangeon, O.;... Rajpurohit, A.; Rey, J.; Rivet, J.-P.; Roy, R.; Santos, N. C.; Signoret, F.; Strabla, L.; Suarez, O.; Toublanc, D.; Tsantaki, M.; Vienney, J.-M.; Wilson, P. A.; Bachschmidt, M.; Colas, F.; Gerteis, O.; Louis, P.; Mario, J.-C.; Marlot, C.; Montier, J.; Perroud, V.; Pic, V.; Romeuf, D.; Ubaud, S.; Verilhac, D., K2-29 b/WASP-152 b: An Aligned and Inflated Hot Jupiter in a Young Visual Binary, 2016ApJ...824...55S
    25. Santerne, A.; Moutou, C.; Tsantaki, M.; Bouchy, F.; Hébrard, G.; Adibekyan, V.; Almenara, J.-M.;... Rajpurohit, A.; Rey, J.; Santos, N. C., SOPHIE velocimetry of Kepler transit candidates. XVII. The physical properties of giant exoplanets within 400 days of period, 2016A&A...587A..64S
    26. Barros, S. C. C.; Almenara, J. M.; Demangeon, O.; Tsantaki, M.; Santerne, A.; Armstrong, D. J.;...; Rajpurohit, A.; Rivet, J.-P.; Spake, J.; Suarez, O.; Toublanc, D.; Walker, S. R., Photodynamical mass determination of the multiplanetary system K2-19, 2015MNRAS.454.4267B
    27. Armstrong, David J.; Santerne, Alexandre; Veras, Dimitri; Barros, Susana C. C.; Demangeon, Olivier; Lillo-Box, Jorge; McCormac, James; Osborn, Hugh P.; Tsantaki, Maria; Almenara, José-Manuel; Barrado, David; Boisse, Isabelle; Bonomo, Aldo S.; Brown, David J. A.; Bruno, Giovanni; Rey Cerda, Javiera; Courcol, Bastien; Deleuil, Magali; Díaz, Rodrigo F.; Doyle, Amanda P.; Hébrard, Guillaume; Kirk, James; Lam, Kristine W. F.; Pollacco, Don L.; Rajpurohit, Arvind.; Spake, Jessica; Walker, Simon R., One of the closest exoplanet pairs to the 3:2 mean motion resonance: K2-19b and c , 2015A&A...582A..33A
    28. Mousis, O.; Hueso, R.; Beaulieu, J.-P.; Bouley, S.; Carry, B.; Colas, F.; Klotz, A.; Pellier, C.; Petit, J.-M.; Rousselot, P.; Ali-Dib, M.; Beisker, W.; Birlan, M.; Buil, C.; Delsanti, A.; Frappa, E.; Hammel, H. B.; Levasseur-Regourd, A. C.; Orton, G. S.; Sánchez-Lavega, A.; Santerne, A.; Tanga, P.; Vaubaillon, J.; Zanda, B.; Baratoux, D.; Böhm, T.; Boudon, V.; Bouquet, A.; Buzzi, L.; Dauvergne, J.-L.; Decock, A.; Delcroix, M.; Drossart, P.; Esseiva, N.; Fischer, G.; Fletcher, L. N.; Foglia, S.; Gómez-Forrellad, J. M.; Guarro-Fló, J.; Herald, D.; Jehin, E.; Kugel, F.; Lebreton, J.-P.; Lecacheux, J.; Leroy, A.; Maquet, L.; Masi, G.; Maury, A.; Meyer, F.; Pérez-Hoyos, S.; Rajpurohit, A. S.; Rinner, C.; Rogers, J. H.; Roques, F.; Schmude, R. W.; Sicardy, B.; Tregon, B.; Vanhuysse, M.; Wesley, A.; Widemann, T., Instrumental methods for professional and amateur collaborations in planetary astronomy , 2014ExA....38...91M
    29. Rajpurohit, A. S.; Reylé, C.; Allard, F.; Scholz, R.-D.; Homeier, D.; Schultheis, M.; Bayo, A., High-resolution spectroscopic atlas of M subdwarfs. Effective temperature and metallicity , 2014A&A...564A..90R
    30. Reylé, C.; Delorme, P.; Artigau, E.; Delfosse, X.; Albert, L.; Forveille, T.; Rajpurohit, A. S.; Allard, F.; Homeier, D.; Robin, A. C., CFBDS J111807-064016: A new L/T transition brown dwarf in a binary system , 2014A&A...561A..66R
    31. Deshpande, R.; Blake, C. H.; Bender, C. F.; Mahadevan, S.; Terrien, R. C.; Carlberg, J. K.; Zasowski, G.; Crepp, J.; Rajpurohit, A. S.; Reylé, C.; Nidever, D. L.; Schneider, D. P.; Allende Prieto, C.; Bizyaev, D.; Ebelke, G.; Fleming, S. W.; Frinchaboy, P. M.; Ge, J.; Hearty, F.; Hernández, J. Malanushenko, E.; Malanushenko, V.; Majewski, S. R.; Marchwinski, R.; Muna, D.; Oravetz, D.; Pan, K.; Schiavon, R. P.; Shetrone, M.; Simmons, A.; Stassun, K. G.; Wilson, J. C.; Wisniewski, J. P., The SDSS-III APOGEE Radial Velocity Survey of M Dwarfs. I. Description of the Survey and Science Goals , 2013AJ....146..156D
    32. Rajpurohit, A. S.; Reylé, C.; Allard, F.; Homeier, D.; Schultheis, M.; Bessell, M. S.; Robin, A. C, The effective temperature scale of M dwarfs , 2013A&A...556A..15R
    33. Rajpurohit, A. S., Reyle, C., Schultheis, M., Leinert, Ch., Allard, F., Homeier, D., Ratzka, T., Abraham, P., Moster, B., Witte, S., Ryde, N., The very low mass multiple system LHS 1070. A testbed for model atmospheres for the lower end of the main sequence , 2012A&A...545A..85R
    34. Jain, Rajmal, Awasthi, Arun Kumar, Rajpurohit, Arvind Singh, Aschwanden, Markus J., Energy-Dependent Timing of Thermal Emission in Solar Flares , 2011SoPh..270..137J

      35. Conference Proceedings

      1. Maiti, Arijit ; Srivastava, Mudit K. ; Mistry, Bhavesh Kumar ; Patel, Ankita ; Dixit, Vaibhav ; Rajpurohit, Arvind S. ; Kumar, Vipin, " Performance Simulations of M-FOSC-EP instrument for Spectro-polarimetry with 2.5m PRL telescope, 2024asi..confO..05M
      2. Subhajeet Karmakar, Arvind Singh Rajpurohit, Derek Homeier, "Investigation of very low mass binaries using VLT/NaCo, 2023AAS...24134702K
      3. Vipin Kumar, A. S. Rajpurohit, Mudit K. Srivastava, " Exploring the short-term variability of H-alpha and H-beta emissions in a sample of M Dwarfs" , 2022csss.confE.180K
      4. Karmakar, Subhajeet; Rajpurohit, Arvind S.; Allard, France; Homeier, Derek, " Adaptive optics investigation of two VLM binaries" , 2022csss.confE..19K
      5. Vipin Kumar, Mudit Srivastava, Vaibhav Dixit, Bhavesh Mistry, Kevikumar Lad, Ankita Patel, Arvind Rajpurohit , "Designs of Mt. Abu faint object spectrograph and camera - echelle polarimeter (M-FOSC-EP) and its prototype: spectro-polarimeters for PRL 1.2m and 2.5m Mt. Abu Telescopes, India", PROCEEDINGS VOLUME 12184, Ground-based and Airborne Instrumentation for Astronomy IX, SPIE, 2022
      6. Barros, S. C. C.; Almenara, J. M.; Demangeon, O.; Tsantaki, M.; Santerne, A.;... Rajpurohit, A. ; Rivet, J.-P.; Spake, J.; Suarez, O.; Toublanc, D.; Walker, S. R, K2-19, The first K2 muti-planetary system showing TTVs, 2016IAUFM..29A..51B
      7. Rajpurohit, A. S.; Reylé, C.; Schultheis, M.; Allard, F., High resolution spectroscopy of M subdwarfs , 2013sf2a.conf..259R
      8. Allard, F.; Homeier, D.; Freytag, B.; Schaffenberger;, W.; Rajpurohit, A. S., Progress in modeling very low mass stars, brown dwarfs, and planetary mass objects , 2013MSAIS..24..128A
      9. Rajpurohit, A. S.; Reylé, C.; Schultheis, M.; Allard, F.; Scholz, R.; Homeier, D., High-resolution spectroscopy of M subdwarfs , 2013MmSAI..84.1104R
      10. Reylé, C.; Delorme, P.; Artigau, E.; Delfosse, X.; Albert, L.; Forveille, T.; Rajpurohit, A. S.; Allard, F.; Homeier, D.; Robin, A. C. A M/T dwarf binary from the Canada-France Brown Dwarf Survey: probing the L/T transition , 2013MmSAI..84.1050R
      11. Rajpurohit, A. S.; Reylé, C.; Schultheis, M.; Allard, F.; Scholz, R.; Homeier, D., Stellar parameters of M dwarfs from low and high-resolution spectra together with new model atmospheres , 2012sf2a.conf..383R
      12. Rajpurohit, A. S.; Reyle, C., Schultheis, M., Leinert, C., Allard, F., The physical parameters of the low-mass multiple system LHS1070 from Spectral synthesis analysis , 2011sf2a.conf..339R
      13. Reyle, C., Rajpurohit, A. S., Schultheis, M., Allard, F., The Effective Temperature Scale of M Dwarfs from Spectral Synthesis , 2011ASPC..448..929R
      14. Rajpurohit, A. S., Reylé, C, Schultheis, M., Allard, F., Validation of M-dwarf atmosphere models and effective temperature scale of M dwarfs , 2010sf2a.conf..275R

      Contact

      Dr. Arvind Singh
      Astronomy and Astrophysics Division
      Physical Research Laboratory
      Unit of Dept. of Space
      Govt. of India
      Navrangpura, Ahmedabad-380009
      Phone : +91-79-26314602
      Fax : +91-79-26314659
      Email : [email protected]
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