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I'm Dr. Santosh Joshi



Scientist ‘F’ ARIES, Nainital, India

My works

Name: Dr Santosh Joshi

Job Role: Scientist ‘F’ ARIES, Nainital, India

Experience: 25 Years+

Address: Nainital, India

Skills

Proficiency in programming languages such as Python, Fortran, and IDL
Data reduction and analysis using various software packages
Experience with astronomical software and tools like IRAF, MIDAS, and FTOOLS
Project management and organization of scientific workshops and conference
Effective communication of complex scientific ideas through publications and presentations

About

About Me

I am Santosh Joshi, a dedicated Scientist currently serving at the Aryabhatta Research Institute of Observational Sciences (ARIES) in Nainital, India. With a career spanning over two decades, I have contributed significantly to the field of astrophysics, focusing on the photometric variability in chemically peculiar stars, high-resolution spectroscopy, and spectro-polarimetry of pulsating Am stars.

  • Profile: Scientist with a profound expertise in astrophysics, currently holding the position of Scientist ‘F’ at ARIES
  • Domain: Astrophysics, Photometric Variability, High-Resolution Spectroscopy, Spectro-Polarimetry
  • Education: Ph.D. in Astronomy from Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, India
    Ph.D. Supervisor: Prof. Ram Sagar
    Ph.D. Co-supervisor: Prof. Peter Martinez, South African Astronomical Observatory, South Africa
    Post-Doctoral Fellowship at Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, India
  • Language: English, Hindi
  • Teaching and Supervision: Taught pre-PhD courses at ARIES
    Supervised several PhD and project students
    Served as an external examiner for PhD theses globally

0 +   Projects completed

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CV

CV

I am Santosh Joshi, a seasoned Scientist with a profound expertise in astrophysics, currently holding the position of Scientist ‘F’ at the Aryabhatta Research Institute of Observational Sciences (ARIES) in Nainital, India.

Experience


July 2023-Present

Scientist ‘F’

Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, India

The Aryabhatta Research Institute of Observational Sciences (ARIES), located in Nainital, India, is one of the leading research institutes in the field of observational astronomy and astrophysics.

  • 1.Photometric Variability Studies: Investigated the photometric variability in chemically peculiar stars.
    Conducted high-resolution spectroscopy and spectro-polarimetry of pulsating Am stars.
    Worked on the census of variable stars in open and intermediate-age star clusters.
  • 2.Instrumentation Development: Contributed to the development and enhancement of astronomical instruments.
    Implemented advanced techniques for time-series analysis and photometric data reduction.

2021-Present

Supervision to Project Students

ARIES

Dishani Mallick

  • Institution: IIT, Dhanbad
    Project Title: "Identification and Classification of Variable Stars Using Machine Learning"
    Duration: 24 May - 24 July 2023

Mr. Ganesh Pawar

  • Institution: Department of Physics, Mumbai University
    Project Title: "Low-Resolution Spectroscopy of Be Stars"
    Duration: 01 February - 30 June 2022 (online)
    Current Position: PhD from Copernicus Astronomical Center of Polish Academy of Sciences, Poland



Education


July 1997 - July 2000

Ph.D. in Physics (Astronomy)

Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, India

Supervisor: Prof. Ram Sagar

1994 - 1996

Master of Science (M.Sc.) in Physics

Kumaun University, Nainital, India

Focus: Physics with a specialization in Astronomy

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Publications

Publications

Below are some of my publications with associated links.

Proceedings of the 3rd BINA Workshop: Scientific Potential of Indo-Belgian Co-operation

In this report, we present an overview of the 3rd BINA workshop hosted by ARIES, Nainital on a broad theme the Scientific potential of the Indo-Belgian co-operation. Further, an introduction of the proceedings of the 3rd BINA workshop is also delineated along with possible areas where there is potential to extend Indo-Belgian cooperation in the current era of multi-wavelength astronomy.

HD 12098: A highly distorted dipole mode in an obliquely pulsating roAp star

HD 12098 is a rapidly oscillating Ap star pulsating in the most distorted dipole mode yet observed in this class of star. Using Transiting Exoplanet Survey Satellite (TESS) Sector 58 observations, we show that there are photometric spots at both the magnetic poles of this star.

Seismic modeling of six pulsating hot subdwarfs observed by TESS and Galactic population study of hot subdwarf pulsators

We report the results of our analysis of six gravity-mode pulsating hot subdwarf stars observed in the short cadence mode by Transiting Exoplanet Survey Satellite. We detected at least 10 pulsation periods in each star, searched for multiplets, and used an asymptotic period spacing to identify modes.


Asteroseismology of the mild Am Delta Sct star HD118660

The Nainital-Cape survey is a dedicated research programme to search for and study the pulsational variability in chemically peculiar stars in the Northern Hemisphere.

On the stability and pulsation in models of B[e] star MWC 137

B [e] type stars are characterized by strong emission lines, photometric, and spectroscopic variabilities and unsteady mass-loss rates. MWC 137 is a galactic B [e] type star situated in the constellation Orion.

VI CCD photometric detection of variable stars in the young open cluster NGC 6823

We present stellar variability towards the young open cluster NGC 6823. Time series V- and I-band CCD photometry led to identification and characterization of 88 variable stars, of which only 14 have been previously recognized.

Study of Chemically Peculiar Stars-I: High-resolution Spectroscopy and K2 Photometry of Am Stars in the Region of M44

We present a study based on the high-resolution spectroscopy and K2 space photometry of five chemically peculiar stars in the region of the open cluster M44. The analysis of the high- precision photometric K2 data reveals that the light variations in HD 73045 and HD 76310 are rotational in nature and caused by spots or cloud-like co-rotating structures, which are non-stationary and short-lived.

HERMES spectroscopy of normal A and Am stars;

The nominal Kepler mission provided very high precision photometric data. Using these data, interesting phenomena such as spots, and 'hump and spike'features were observed in the light curves of some normal A and metallic lined A stars (Am stars). However, the connection between such phenomena and the chemical peculiarity of the Am stars is still unclear.

LAMOST J045019.27+394758.7, with peculiar abundances of N, Na, V, Zn, is possibly a Sculptor dwarf galaxy escapee

The nominal Kepler mission provided very high precision photometric data. Using these data, interesting phenomena such as spots, and 'hump and spike'features were observed in the light curves of some normal A and metallic lined A stars (Am stars). However, the connection between such phenomena and the chemical peculiarity of the Am stars is still unclear.

Asteroseismology of SZ Lyn using multiband high time resolution photometry from ground and space

The nominal Kepler mission provided very high precision photometric data. Using these data, interesting phenomena such as spots, and 'hump and spike'features were observed in the light curves of some normal A and metallic lined A stars (Am stars). However, the connection between such phenomena and the chemical peculiarity of the Am stars is still unclear.

Instabilities and pulsations in models of the B-type supergiant κ Cassiopeiae (HD 2905)

or the B-type supergiant κ Cassiopeiae (HD 2905), variabilities with periods between several hours and a few days have been observed both photometrically and spectroscopically. A recent study of this star by Simón-Díaz et al. has revealed variability with a dominant period of 2.7 d. To understand this variability, we present a linear non-adiabatic stability analysis with respect to radial perturbations for models of κ Cassiopeiae. Instabilities associated with the fundamental mode and the first overtone are identified for models with masses between 27 and 44 M⊙.

Fast photometric variability of very low mass stars in IC 348: detection of superflare in an M dwarf

We present here optical I-band photometric variability study down to ≃19 mag of a young (∼2–3 Myr) star-forming region IC 348 in the Perseus molecular cloud. We aim to explore the fast rotation (in the time-scales of hours) in very low-mass stars including brown dwarfs (BDs). From a sample of 177 light curves using our new I-band observations, we detect new photometric variability in 22 young M dwarfs including 6 BDs, which are bonafide members in IC 348 and well characterized in the spectral type of M dwarfs.

Census of the Young Stellar Population in the Galactic H II Region Sh2-242;

We present here identification and characterization of the young stellar population associated with an active star-forming site Sh2-242. We used our own new optical imaging and spectroscopic observational data, as well as several archival catalogs, eg, Pan- STARRS 1, Gaia DR2, IPHAS, Wide-field InfraRed Camera, 2MASS, and Spitzer.

Variable stars in the field of intermediate-age open cluster NGC 559

This work presents the first long-term photometric variability survey of the intermediate-age open cluster NGC 559. Time series V-band photometric observations on 40 nights taken over more than 3 yr with three different telescopes are analysed to search for variable stars in the cluster. We investigate the data for the periodicity analysis and reveal 70 variable stars including 67 periodic variables in the target field, all of them are newly discovered

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Contact

Contact Me

Below are the details to reach out to me!

Address

Nainital, India

Contact Number

: +91-5942-217751 (Office), +917895580004 (Mob.)

Email Address

sjoshiaries@gmail.com

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